<blockquote>One day when he was censured for keeping company with evil men, the reply he made was, “Well, physicians are in attendance on their patients without getting the fever themselves.” “It is strange,” said he, “that we weed out the darnel from the corn and the unfit in war, but do not excuse evil men from the service of the state.” When he was asked what advantage had accrued to him from philosophy, his answer was, “The ability to hold converse with myself.” Some one having called upon him over the wine for a song, he replied, “Then you must accompany me on the pipe.” When Diogenes begged a coat of him, he bade him fold his cloak around him double.

Source: Lives of the Eminent Philosophers (1925) by Diogenes Laërtius, translated by Robert Drew Hicks </blockquote>