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Rh unlimited intellectual liberty. Priests read without scruple or hesitation books and writings which fall under the rules of the Index. The habit of intellectual independence is easily formed. We are surrounded by both Gnostics and Agnostics: by those who out of their own consciousness are wiser than the Church, and by others who measure what can be known by what they know. Catholics would not consciously listen to either of these schools of error; and yet they are continually and unconsciously taking in their erroneous premises, and principles, and assumptions in their daily contact with the world. As to false theology and false interpretation of Scripture, they would be upon their guard; but they are off their guard in philosophy, and readily open their ears and their intellect to the aberrations of modern metaphysics. They think that as in philosophy there is no heresy, so there need be no fear. But a false philosophy undermines faith, and one philosophical error, like a rotten beam, will loosen the whole superstructure of theology. Priests have of all men need to be upon their guard, for they are the guides and teachers of the faithful. It is dangerous to receive and to propagate the least intellectual error. We have need to live in great watchfulness against what is glorified as "modern thought." The thought of