Diogenes Laertius, book II Simon
When Pericles promised to support him and urged him to come to him, his reply was, "I will not part with my free speech for money."
I hear that you ridicule our wisdom in the presence of Dionysius. I admit that I am a shoemaker and that I do work of that nature, and in like manner I would, if it were necessary, cut straps once more for the purpose of admonishing foolish men who think that they are living in great luxury. Antisthenes shall be the chastiser of your foolish jests. For you are writing him letters which make fun of our way of life. But let what I have said to you in jest suffice. At any rate, remember hunger and thirst, for these are worth much to those who pursue self control. - Socratic Epistle 12, in A. J. Malherbe, (1977) The Cynic Epistles, A Study Edition. SBL