<blockquote>But some make [Aristippus'] answer to have been, “When I needed wisdom, I went to Socrates; now that I am in need of money, I come to you.” He used to complain of mankind that in purchasing earthenware they made trial whether it rang true, but had no regular standard by which to judge life. Others attribute this remark to Diogenes.

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