Ad Petri Cathedram §11

¹¹ Anyone who consciously and wantonly attacks known truth, who arms himself with falsehood in his speech, his writings, or his conduct in order to attract and win over less learned men and to shape the inexperienced and impressionable minds of the young to his own way of thinking, takes advantage of the inexperience and innocence of others and engages in an altogether despicable business.