He waged constant warfare against all whose philosophy was not practical, but for show. So when he saw a cynic, with threadbare cloak and wallet, but a braying-pestle instead of a staff, proclaiming himself loudly as a follower of Antisthenes, Crates, and Diogenes, he said: ‘Tell us no lies; your master is the professor of braying.’
Source: The Works of Lucian of Samosata. Translated by Fowler, H W and F G. Oxford: The Clarendon Press. 1905.