The Republic by Plato Part 6 Page 23

asking why are the majority bad, which question of necessity brought us back to the examination and definition of the true philosopher.

Exactly.

And we have next to consider the corruptions of the philosophic nature, why so many are spoiled and so few escape spoiling — I am speaking of those who were said to be useless but not wicked — and, when we have done with them, we will speak of the imitators of philosophy, what manner of men are they who aspire after a profession which is above them and of which they are unworthy, and then, by their manifold inconsistencies, bring upon philosophy, and upon all philosophers, that universal reprobation of which we speak.

What are these corruptions? he said.