Proper noun
Antisthenes
A Greek male given name from Ancient Greek, notably borne by Antisthenes of Athens (445–365 B.C.), a Greek philosopher, founder of the school of Cynicism and a pupil of Socrates
Antisthenes used to say that envious people were devoured by their own disposition, just as iron is by rust. Diogenes Laërtius
Antisthenes ... was asked on one occasion what learning was the most necessary, and he replied, "To unlearn one's bad habits." Antisthenes
Antisthenes ... used to say that the wise man would regulate his conduct as a citizen, not according to the established laws of the state, but according to the law of virtue. Antisthenes
Antisthenes ... said once to a youth from Pontus who was on the point of coming to him to be his pupil, and was asking him what things he wanted, "You want a new book, and a new pen, and a new tablet;" - meaning a new mind. Antisthenes