There were, however, among the wise men some who despised the knowledge of the orators, lexicographers and schoolmasters, and cavilled at those who devoted themselves to these professions. To these calumniators belonged Epicurus and Pythagoras. They held that these occupations were of no use for acquiring wisdom, since the grammarians were nothing but schoolmasters, the poets nothing but weathercocks and liars, the orators mere calumniators, cajolers and rabid revolutionaries.
On a cursory search, I can't find any corroboration of the like.