6 It is greatly to be feared that some influence of this spirit, so evil, and already so widely diffused, might insinuate itself even among ecclesiastics, particularly among those of less experience. What sad effects would not arise if that gravity of conduct which belongs to the priest, should be in any way lessened; if he should yield with lightness to the charm of every novelty; if he should deport himself with pretentious indocility towards his superiors; if he should lose that weight and measure in discussion which is so necessary, particularly in matters of faith and morals.
Source: Fin dal Principio (Vatican.va)