10 It must therefore be clearly admitted that, in the life of a Christian, the intellect must be entirely subject to God's authority. And if, in this submission of reason to authority, our self-love, which is so strong, is restrained and made to suf fez, this only proves the necessity to a Christian of long-suffering not only in will but also in intellect. We would remind those persons of this truth who desire a kind of Christianity such as they themselves have devised, whose precepts should be very mild, much more indulgent towards human nature, and requiring little if any hardships to be borne. They do not properly understand the meaning of faith and Christian precepts. They do not see that the Cross meets us everywhere, the model of our life, the eternal standard of all who wish to follow Christ in reality and not merely in name.
Source: Tametsi Futura Prospicientibus (Vatican.va)