His Holiness Pope Pius XII
Encyclical Letter Concerning Some False Opinions Which Threaten to Undermine the Foundations of Catholic Doctrine
August 12, 1950
To Our Venerable Brethren, Patriarchs, Primates, Archbishops, Bishops and Other Local Ordinaries Enjoying Peace and Communion With the Holy See. Venerable Brethren, Greetings and Apostolic Benediction!
1). Disagreement and error among men on moral and religious matters have always been a cause of profound sorrow to all good men, but above all to the true and loyal sons of the church, especially today, when we see the principles of Christian culture being attacked on all sides.
2. It is not surprising that such discord and error should always have existed outside the fold of Christ. For though, absolutely speaking, human reason by its own natural force and light can arrive at a true and certain knowledge of the one personal God, Who by His providence watches over and governs the world, and also of the natural law, which the Creator has written in our hearts, still there are not a few obstacles to prevent reason from making efficient and fruitful use of its natural ability. The truths that have to do with God and the relations between God and men, completely surpass the sensible order and demand self-surrender and self-abnegation in order to be put into practice and to influence practical life. Now the human intellect, in gaining the knowledge of such truths is hampered both by the activity of the senses and the imagination, and by evil passions arising from original sin. Hence men easily persuade themselves in such matters that what they do not wish to believe is false or at least doubtful.
3. It is for this reason that divine revelation must be considered morally necessary so that those religious and moral truths which are not of their nature beyond the reach of reason in the present condition of the human race, may be known by all men readily -- with a firm certainty and with freedom from all error.
4. Furthermore the human intelligence sometimes experiences difficulties in forming a judgment about the credibility of the Catholic faith, notwithstanding the many wonderful external signs God has given, which are sufficient to prove with certitude by the natural light of reason alone the divine origin of the Christian religion. For man can, whether from prejudice or passion or bad faith, refuse and resist not only the evidence of the external proofs that are available, but also the impulses of actual grace.
5. If anyone examines the state of affairs outside the Christian fold, he will easily discover the principal trends that not a few learned men are following. Some imprudently and indiscreetly hold that evolution, which has not been fully proved even in the domain of natural sciences, explains the origin of all things, and audaciously support the monistic and pantheistic opinion that the world is in continual evolution. Communists gladly subscribe to this opinion so that, when the souls of men have been deprived of every idea of a personal God, they may the more efficaciously defend and propagate their dialectical materialism.
6. Such fictitious tenets of evolution which repudiate all that is absolute, firm, and immutable, have paved the way for the new erroneous philosophy which, rivaling idealism, immanentism, and pragmatism, has assumed the name of existentialism, since it concerns itself only with existence of individual things and neglects all consideration of their immutable essences.
7. There is also a certain historicism, which attributing value only to the events of man's life, overthrows the foundation of all truth and absolute law, both on the level of philosophical speculations and especially to Christian dogmas.
8. In all this confusion of opinion it is some consolation to Us to see former adherents of rationalism today frequently desiring to return to the fountain of divinely communicated truth, and to acknowledge and profess the word of God as contained in Sacred Scripture as the foundation of religious teaching. But at the same time it is a matter of regret that not a few of these, the more firmly they accept the word of God, so much the more do they diminish the value of human reason, and the more they exalt the authority of God the Revealer, the more severely do they spurn the teaching office of the Church, which has been instituted by Christ, Our Lord, to preserve and interpret divine revelation. This attitude is not only plainly at variance with Holy Scripture, but is shown to be false by experience also. For often those who disagree with the True Church complain openly of their disagreement in matters of dogma and thus unwillingly bear witness to the necessity of a living Teaching Authority.
9. Now Catholic theologians and philosophers, whose grave duty it is to defend natural and supernatural truth and instill it in the hearts of men, cannot afford to ignore or neglect these more or less erroneous opinions. Rather, they must come to understand these same theories well, both because diseases are not properly treated unless they are rightly diagnosed, and because sometimes even in these false theories a certain amount of truth is contained, and, finally, because these theories provoke more subtle discussion and evaluation of philosophical and theological truths.
10. If philosophers and theologians strive only to derive such profit from the careful examination of these doctrines, there would be no reason for any intervention by the Teaching Authority of the Church. However, although We know that Catholic teachers generally avoid these errors, it is apparent, however, that some today, as in Apostolic times, desirous of novelty, and fearing to be considered ignorant of recent scientific findings, try to withdraw themselves from the Sacred Teaching Authority and are accordingly in danger of gradually departing from revealed truth and of drawing others along with them into error.
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