their duty to teach the brethren, and confirm them in the faith.
Now, the Apostle warns us that the faithful of Christ are often deceived in mind 'by philosophy and vain deceit,'[1] and that thus the sincerity of faith is corrupted in men. For this reason the Supreme Pastors of the Church have always held that it is part of their office to advance, with all their power, knowledge truly so called; but at the same time to watch with the greatest care that all human learning shall be imparted according to the rule of the Catholic faith. Especially is this true of 'philosophy,' on which the right treatment of other sciences depends in great measure. We Ourselves spoke to you shortly of this, among other things, Venerable Brothers, when first We addressed you all by an Encyclical Letter. Now, by the importance of this matter, and by the state of the times, We are forced again to write to you, that you may so organize the course of philosophical studies as to insure their perfect correspondence with the gift of Faith, and also their agreement with the dignity of human knowledge.
If anyone look carefully at the bitterness of our times, and if, further, he consider earnestly the cause of those things that are done in public and in private, he will discover with certainty the fruitful root of the evils which are now overwhelming us, and of the evils which we greatly fear. The cause he will find to consist in this—evil teaching about things, human and divine, has come forth from the schools of philosophers; it has crept into all the orders of the State; and it has been received with the common applause of very many. Now, it has been implanted in man by Nature to follow reason as the guide of his actions, and therefore, if the understanding go wrong in anything, the will easily follows. Hence it comes about that wicked opinions in the understanding, flow into human actions and make them bad. On the other hand, if the mind of man be healthy, and strongly grounded in solid and true principles, it will assuredly be the source of great blessings,
