The following article consists of excerpts from the Encyclical PASCENDI DOMINICI GREGIS by Pope St. Pius X. (Highlighted sections were added by the editor of this website.)
PASCENDI DOMINICI GREGIS
ON THE DOCTRINE OF THE MODERNISTS
Encyclical of Pope Pius X promulgated on September 8, 1907.
3. Although they express their astonishment that We should number them amongst the enemies of the Church, no one will be reasonably surprised that We should do so, if, leaving out of account the internal disposition of the soul, of which God alone is the Judge, he considers their tenets, their manner of speech, and their action. Nor indeed would he be wrong in regarding them as the most pernicious of all the adversaries of the Church. For, as We have said, they put into operation their designs for her undoing, not from without but from within. Hence, the danger is present almost in the very veins and heart of the Church, whose injury is the more certain from the very fact that their knowledge of her is more intimate. Moreover, they lay the ax not to the branches and shoots, but to the very root, that is, to the faith and its deepest fibers. And once having struck at this root of immortality, they proceed to diffuse poison through the whole tree, so that there is no part of Catholic truth which they leave untouched, none that they do not strive to corrupt. Further, none is more skillful, none more astute than they, in the employment of a thousand noxious devices; for they play the double part of rationalist and Catholic, and this so craftily that they easily lead the unwary into error; and as audacity is their chief characteristic, there is no conclusion of any kind from which they shrink or which they do not thrust forward with pertinacity and assurance To this must be added the fact, which indeed is well calculated to deceive souls, that they lead a life of the greatest activity, of assiduous and ardent application to every branch of learning, and that they possess, as a rule, a reputation for irreproachable morality. Finally, there is the fact which is all hut fatal to the hope of cure that their very doctrines have given such a bent to their minds, that they disdain all authority and brook no restraint; and relying upon a false conscience, they attempt to ascribe to a love of truth that which is in reality the result of pride and obstinacy.
4. It is one of the cleverest devices of the Modernists (as they are commonly and rightly called) to present their doctrines without order and systematic arrangement, in a scattered and disjointed manner, so as to make it appear as if their minds were in doubt or hesitation, whereas in reality they are quite fixed and steadfast. For this reason it will be of advantage, Venerable Brethren, to bring their teachings together here into one group, and to point out their interconnection, and thus to pass to an examination of the sources of the errors, and to prescribe remedies for averting the evil results.
5. To proceed in an orderly manner in this somewhat abstruse subject, it must first of all be noted that the Modernist sustains and includes within himself a manifold personality; he is a philosopher, a believer, a theologian, an historian, a critic, an apologist, a reformer. These roles must be clearly distinguished one from another by all who would accurately understand their system and thoroughly grasp the principles and the outcome of their doctrines.
6. We begin, then, with the philosopher. Modernists place the foundation of religious philosophy in that doctrine which is commonly called Agnosticism. According to this teaching human reason is confined entirely within the field of phenomena, that is to say, to things that appear, and in the manner in which they appear: it has neither the right nor the power to overstep these limits. Hence it is incapable of lifting itself up to God, and of recognizing His existence, even by means of visible things. From this it is inferred that God can never be the direct object of science, and that, as regards history, He must not be considered as an historical subject. Given these premises, everyone will at once perceive what becomes of Natural Theology, of the motives of credibility, of external revelation. The modernists simply sweep them entirely aside; they include them in Intellectualism, which they denounce as a system which is ridiculous and long since defunct. Nor does the fact that the Church has formally condemned these portentous errors exercise the slightest restraint upon them. Yet the Vatican Council has defined, “If anyone says that the one true God, our Creator and Lord, cannot be known with certainty by the natural light of human reason by means of the things that are made, let him be anathema”; and also, “If anyone says that it is not possible or not expedient that man be taught, through the medium of divine revelation, about God and the worship to be paid Him, let him be anathema’’; and finally, “If anyone says that divine revelation cannot be made credible by external signs, and that therefore men should be drawn to the faith only by their personal internal experience or by private inspiration, let him be anathema.” It may be asked, in what way do the Modernists contrive to make the transition from Agnosticism, which is a state of pure nescience, to scientific and historic Atheism, which is a doctrine of positive denial; and consequently, by what legitimate process of reasoning, they proceed from the fact of ignorance as to whether God has in fact intervened in the history of the human race or not, to explain this history, leaving God out altogether, as if He really had not intervened. Let him answer who can. Yet it is a fixed and established principle among them that both science and history must be atheistic: and within their boundaries there is room for nothing but phenomena; God and all that is divine are utterly excluded. We shall soon see clearly what, as a consequence of this most absurd teaching, must be held touching the most sacred Person of Christ, and the mysteries of His life and death, and of His Resurrection and Ascension into Heaven.
7. However, this Agnosticism is only the negative part of the system of the Modernists: the positive part consists in what they call vital immanence. Thus they advance from one to the other. Religion, whether natural or supernatural, must, like every other fact, admit of some explanation. But when natural theology has been destroyed, and the road to revelation closed by the rejection of the arguments of credibility, and all external revelation absolutely denied, it is clear that this explanation will be sought in vain outside of man himself. It must, therefore, be looked for in man; and since religion is a form of life, the explanation must certainly be found in the life of man. In this way is formulated the principle of religious immanence.
15. There is yet another element in this part of their teaching which is absolutely contrary to Catholic truth. For what is laid down as to experience is also applied with destructive effect to tradition, which has always been maintained by the Catholic Church. Tradition, as understood by the Modernists, is a communication with others of an original experience, through preaching by means of the intellectual formula. To this formula, in addition to its representative value they attribute a species of suggestive efficacy which acts firstly in the believer by stimulating the religious sense, should it happen to have grown sluggish, and by renewing the experience once acquired, and secondly, in those who do not yet believe by awakening in them for the first time the religious sense and producing the experience. In this way is religious experience spread abroad among the nations; and not merely among contemporaries by preaching, but among future generations both by books and by oral transmission from one to another. Sometimes this communication of religious experience takes root and thrives, at other times it withers at once and dies. For the Modernists, to live is a proof of truth, since for them life and truth are one and the same thing. Thus we are once more led to infer that all existing religions are equally true, for otherwise they would not survive.
26. To conclude this whole question of faith and its various branches, we have still to consider, Venerable Brethren, what the Modernists have to say about the development of the one and the other. First of all they lay down the general principle that in a living religion everything is subject to change, and must in fact be changed. In this way they pass to what is practically their principal doctrine, namely, evolution. To the laws of evolution everything is subject under penalty of death--dogma, Church, worship, the Books we revere as sacred, even faith itself. The enunciation of this principle will not be a matter of surprise to anyone who bears in mind what the Modernists have had to say about each of these subjects. Having laid down this law of evolution, the Modernists themselves teach us how it operates. And first, with regard to faith. The primitive form of faith, they tell us, was rudimentary and common to all men alike, for it had its origin in human nature and human life. Vital evolution brought with it progress, not by the accretion of new and purely adventitious forms from without, but by an increasing perfusion of the religious sense into the conscience. The progress was of two kinds: negative, by the elimination of all extraneous elements, such, for example, as those derived from the family or nationality; and positive, by that intellectual and moral refining of man, by means of which the idea of the divine became fuller and clearer, while the religious sense became more acute. For the progress of faith the same causes are to be assigned as those which are adduced above to explain its origin. But to them must be added those extraordinary men whom we call prophets--of whom Christ was the greatest-- both because in their lives and their words there was something mysterious which faith attributed to the divinity, and because it fell to their lot to have new and original experiences fully in harmony with the religious needs of their time. The progress of dogma is due chiefly to the fact that obstacles to the faith have to be surmounted, enemies have to be vanquished, and objections have to be refuted. Add to this a perpetual striving to penetrate ever more profoundly into those things which are contained in the mysteries of faith. Thus, putting aside other examples, it is found to have happened in the case of Christ: in Him that divine something which faith recognized in Him was slowly and gradually expanded in such a way that He was at last held to be God. The chief stimulus of the evolution of worship consists in the need of accommodation to the manners and customs of peoples, as well as the need of availing itself of the value which certain acts have acquired by usage. Finally, evolution in the Church itself is fed by the need of adapting itself to historical conditions and of harmonizing itself with existing forms of society. Such is their view with regard to each. And here, before proceeding further, We wish to draw attention to this whole theory of necessities or needs, for beyond all that we have seen, it is, as it were, the base and foundation of that famous method which they describe as historical.
28. It is thus, Venerable Brethren, that for the Modernists, whether as authors or propagandists, there is to be nothing stable, nothing immutable in the Church. Nor, indeed, are they without forerunners in their doctrines, for it was of these that Our predecessor Pius IX wrote: “These enemies of divine revelation extol human progress to the skies, and with rash and sacrilegious daring would have it introduced into the Catholic religion as if this religion were not the work of God but of man, or some kind of philosophical discovery susceptible of perfection by human efforts.”  On the subject of revelation and dogma in particular, the doctrine of the Modernists offers nothing new. We find it condemned in the Syllabus of Pius IX, where it is enunciated in these terms: “Divine revelation is imperfect, and therefore subject to continual and indefinite progress, corresponding with the progress of human reason”; and condemned still more solemnly in the Vatican Council: “The doctrine of the faith which God has revealed has not been proposed to human intelligences to be perfected by them as if it were a philosophical system, but as a divine deposit entrusted to the Spouse of Christ to be faithfully guarded and infallibly interpreted. Hence also that sense of the sacred dogmas is to be perpetually retained which our Holy Mother the Church has once declared, nor is this sense ever to be abandoned on plea or pretext of a more profound comprehension of the truth.”  Nor is the development of our knowledge, even concerning the faith, barred by this pronouncement; on the contrary, it is supported and maintained. For the same Council continues: “Let intelligence and science and wisdom, therefore, increase and progress abundantly and vigorously in individuals, and in the mass, in the believer and in the whole Church, throughout the ages and the centuries--but only in its own kind, that is, according to the same dogma, the same sense, the same acceptation.”
Such, Venerable Brethren, is a summary description of the apologetic method of the Modernists, in perfect harmony with their doctrines--methods and doctrines replete with errors, made not for edification but for destruction, not for the making of Catholics but for the seduction of those who are Catholics into heresy; and tending to the utter subversion of all religion.
38. It remains for Us now to say a few words about the Modernist as reformer. From all that has preceded, it is abundantly clear how great and how eager is the passion of such men for innovation. In all Catholicism there is absolutely nothing on which it does not fasten. They wish philosophy to be reformed, especially in the ecclesiastical seminaries. They wish the scholastic philosophy to be relegated to the history of philosophy and to be classed among absolute systems, and the young men to be taught modern philosophy which alone is true and suited to the times in which we live. They desire the reform of theology: rational theology is to have modern philosophy for its foundation, and positive theology is to be founded on the history of dogma. As for history, it must be written and taught only according to their methods and modern principles. Dogmas and their evolution, they affirm, are to be harmonized with science and history. In the Catechism no dogmas are to be inserted except those that have been reformed and are within the capacity of the people. Regarding worship, they say, the number of external devotions is to he reduced, and steps must be taken to prevent their further increase, though, indeed, some of the admirers of symbolism are disposed to be more indulgent on this head. They cry out that ecclesiastical government requires to be reformed in all its branches, but especially in its disciplinary and dogmatic departments They insist that both outwardly and inwardly it must be brought into harmony with the modern conscience which now wholly tends towards democracy; a share in ecclesiastical government should therefore be given to the lower ranks of the clergy and even to the laity and authority which is too much concentrated should be decentralized. The Roman Congregations and especially the index and the Holy Office, must be likewise modified The ecclesiastical authority must alter its line of conduct in the social and political world; while keeping outside political organizations it must adapt itself to them in order to penetrate them with its spirit. With regard to morals, they adopt the principle of the Americanists, that the active virtues are more important than the passive, and are to be more encouraged in practice. They ask that the clergy should return to their primitive humility and poverty, and that in their ideas and action they should admit the principles of Modernism; and there are some who, gladly listening to the teaching of their Protestant masters, would desire the suppression of the celibacy of the clergy. What is there left in the Church which is not to be reformed by them and according to their principles?
39. It may, perhaps, seem to some, Venerable Brethren, that We have dealt at too great length on this exposition of the doctrines of the Modernists. But it was necessary that We should do so, both in order to meet their customary charge that We do not understand their ideas, and to show that their system does not consist in scattered and unconnected theories, but, as it were, in a closely connected whole, so that it is not possible to admit one without admitting all. For this reason, too, We have had to give to this exposition a somewhat didactic form, and not to shrink from employing certain unwonted terms which the Modernists have brought into use. And now with Our eyes fixed upon the whole system, no one will be surprised that We should define it to be the synthesis of all heresies. Undoubtedly, were anyone to attempt the task of collecting together all the errors that have been broached against the faith and to concentrate into one the sap and substance of them all, he could not succeed in doing so better than the Modernists have done. Nay, they have gone farther than this, for, as We have already intimated, their system means the destruction not of the Catholic religion alone, but of all religion. Hence the rationalists are not wanting in their applause, and the most frank and sincere among them congratulate themselves on having found in the Modernists the most valuable of all allies.
Let us turn for a moment, Venerable Brethren, to that most disastrous doctrine of agnosticism. By it every avenue to God on the side of the intellect is barred to man, while a better way is supposed to be opened from the side of a certain sense of the soul and action. But who does not see how mistaken is such a contention? For the sense of the soul is the response to the action of the thing which the intellect or the outward senses set before it. Take away the intelligence, and man, already inclined to follow the senses, becomes their slave. Doubly mistaken, from another point of view, for all these fantasies of the religious sense will never be able to destroy common sense, and common sense tells us that emotion and everything that leads the heart captive proves a hindrance instead of a help to the discovery of truth. We speak of truth in itself--for that other purely subjective truth, the fruit of the internal sense and action, if it serves its purpose for the play of words, is of no benefit to the man who wants above all things to know whether outside himself there is a God into whose hands he is one day to fall. True, the Modernists call in experience to eke out their system, but what does this experience add to that sense of the soul? Absolutely nothing beyond a certain intensity and a proportionate deepening of the conviction of the reality of the object. But these two will never make the sense of the soul into anything but sense, nor will they alter its nature, which is liable to deception when the intelligence is not there to guide it; on the contrary, they but confirm and strengthen this nature, for the more intense the sense is the more it is really sense. And as we are here dealing with religious sense and the experience involved in it, it is known to you, Venerable Brethren, how necessary in such a matter is prudence, and the learning by which prudence is guided. You know it from your own dealings with souls, and especially with souls in whom sentiment predominates; you know it also from your reading of works of ascetical theology--works for which the Modernists have but little esteem, but which testify to a science and a solidity far greater than theirs, and to a refinement and subtlety of observation far beyond any which the Modernists take credit to themselves for possessing. It seems to Us nothing short of madness, or at the least consummate temerity to accept for true, and without investigation, these incomplete experiences which are the vaunt of the Modernist. Let Us for a moment put the question: If experiences have so much force and value in their estimation, why do they not attach equal weight to the experience that so many thousands of Catholics have that the Modernists are on the wrong path? Is it that the Catholic experiences are the only ones which are false and deceptive? The vast majority of mankind holds and always will hold firmly that sense and experience alone, when not enlightened and guided by reason, cannot reach to the knowledge of God. What, then, remains but atheism and the absence of all religion? Certainly it is not the doctrine of symbolism that will save us from this. For if all the intellectual elements, as they call them, of religion are nothing more than mere symbols of God, will not the very name of God or of divine personality be also a symbol, and if this be admitted, the personality of God will become a matter of doubt and the gate will be opened to pantheism? And to pantheism pure and simple that other doctrine of the divine immanence leads directly. For this is the question which We ask: Does or does not this immanence leave God distinct from man? If it does, in what does it differ from the Catholic doctrine, and why does it reject the doctrine of external revelation? If it does not, it is pantheism. Now the doctrine of immanence in the Modernist acceptation holds and professes that every phenomenon of conscience proceeds from man as man. The rigorous conclusion from this is the identity of man with God, which means pantheism. The distinction which Modernists make between science and faith leads to the same conclusion. The object of science, they say, is the reality of the knowable; the object of faith, on the contrary, is the reality of the unknowable. Now, what makes the unknowable unknowable is the fact that there is no proportion between its object and the intellect--a defect of proportion which nothing whatever, even in the doctrine of the Modernist, can suppress. Hence the unknowable remains and will eternally remain unknowable to the believer as well as to the philosopher. Therefore if any religion at all is possible, it can only be the religion of an unknowable reality. And why this might not be that soul of the universe, of which certain rationalists speak, is something which certainly does not seem to Us apparent. These reasons suffice to show superabundantly by how many roads Modernism leads to atheism and to the annihilation of all religion. The error of Protestantism made the first step on this path; that of Modernism makes the second; atheism makes the next.
40. To penetrate still deeper into the meaning of Modernism and to find a suitable remedy for so deep a sore, it behooves Us, Venerable Brethren, to investigate the causes which have engendered it and which foster its growth. That the proximate and immediate cause consists in an error of the mind cannot be open to doubt. We recognize that the remote causes may be reduced to two: curiosity and pride. Curiosity by itself, if not prudently regulated, suffices to account for all errors. Such is the opinion of Our predecessor, Gregory XVI, who wrote: “A lamentable spectacle is that presented by the aberrations of human reason when it yields to the spirit of novelty, when against the warning of the Apostle it seeks to know beyond what it is meant to know, and when relying too much on itself it thinks it can find the truth outside the Catholic Church wherein truth is found without the slightest shadow of error.”
But it is pride which exercises an incomparably greater sway over the soul to blind it and lead it into error, and pride sits in Modernism as in its own house, finding sustenance everywhere in its doctrines and lurking in its every aspect. It is pride which fills Modernists with that self-assurance by which they consider themselves and pose as the rule for all. It is pride which puffs them up with that vainglory which allows them to regard themselves as the sole possessors of knowledge, and makes them say, elated and inflated with presumption, “We are not as the rest of men,” and which, lest they should seem as other men, leads them to embrace and to devise novelties even of the most absurd kind. It is pride which rouses in them the spirit of disobedience and causes them to demand a compromise between authority and liberty. It is owing to their pride that they seek to be the reformers of others while they forget to reform themselves, and that they are found to be utterly wanting in respect for authority, even for the supreme authority. Truly there is no road which leads so directly and so quickly to Modernism as pride.
41. If we pass on from the moral to the intellectual causes of Modernism, the first and the chief which presents itself is ignorance. Yes, these very Modernists who seek to be esteemed as Doctors of the Church, who speak so loftily of modern philosophy and show such contempt for scholasticism, have embraced the one with all its false glamour, precisely because their ignorance of the other has left them without the means of being able to recognize confusion of thought and to refute sophistry. Their whole system, containing as it does errors so many and so great, has been born of the union between faith and false philosophy.
43. And here we have already some of the artifices employed by Modernists to exploit their wares. What efforts do they not make to win new recruits! They seize upon professorships in the seminaries and universities, and gradually make of them chairs of pestilence.