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.
It is better to fall in with crows than with flatterers; for in the one case you are devoured when dead, in the other case while alive.
Antisthenes ... was asked on one occasion what learning was the most necessary, and he replied, "To unlearn one's bad habits."
Wealth and poverty do not lie in a person's estate, but in their souls.
I have enough to eat till my hunger is stayed, to drink till my thirst is sated; to clothe myself withal; and out of doors not Callias there, with all his riches, is more safe than I from shivering; and when I find myself indoors, what warmer shirting do I need than my bare walls? what ampler greatcoat than the tiles above my head?
There is no work so mean, but it would amply serve me to furnish me with sustenance.
To all my friends without distinction I am ready to display my opulence: come one, come all; and whosoever likes to take a share is welcome to the wealth that lies within my soul.
It was not long before [Diogenes] despised [all the philosophers at Athens] save Antisthenes, whom he cultivated, not so much from approval of the man himself as of the words he spoke, which he felt to be alone true and best adapted to help mankind. For when he contrasted the man Antisthenes with his words, he sometimes made this criticism, that the man himself was much weaker; and so in reproach he would call him a trumpet because he could not hear his own self, no matter how much noise he made. Antisthenes tolerated this banter of his since he greatly admired the man’s character; and so, in requital for being called a trumpet, he used to say that Diogenes was like the wasps, the buzz of whose wings is slight but the sting very sharp.