Pascendi Dominici Gregis §50

⁵⁰ It is also the duty of the bishops to prevent writings infected with Modernism or favourable to it from being read when they have been published, and to hinder their publication when they have not. No book or paper or periodical of this kind must ever be permitted to seminarists or university students. The injury to them would be equal to that caused by immoral reading - nay, it would be greater for such writings poison Christian life at its very fount. The same decision is to be taken concerning the writings of some Catholics, who, though not badly disposed themselves but ill-instructed in theological studies and imbued with modern philosophy, strive to make this harmonize with the faith, and, as they say, to turn it to the account of the faith. The name and reputation of these authors cause them to be read without suspicion, and they are, therefore, all the more dangerous in preparing the way for Modernism.