Romans 1:22

Professing themselves to be wise
The learned men among the Gentiles first called themselves (sofoi) , "Sophi", wise men: and afterwards, to cover their wretched pride and vanity, (filosofoi) , "Philosophers", lovers of wisdom; but notwithstanding all their arrogance, their large pretensions to wisdom, and boast of it

they became fools;
they appeared to be so; they showed themselves to be such in those very things they prided themselves with the knowledge of: as, for instance, Socrates, after he had asserted the unity of God, and is said to die a martyr for the truth; yet one of the last actions of his life was sacrificing a cock to Aesculapius, at least he desired his friend Crito to do it.