On the Giants (38-39)

But as many as are masters of themselves show that all that brilliant prosperity, which is an object of so much contention, is in subordination to the mind, which is the principal part of them, receiving it when it comes, so as to make a good use of it, but not pursuing it if it keeps aloof, as being able to be happy even without it.

But he who pursues it eagerly and follows upon its track, fills philosophy with base opinions; on which account he is said to uncover its nakedness, for how can there be any concealment or ignorance of the reproaches to which those men are justly exposed, who profess indeed to be wise men, but who make a traffic of wisdom, and bargain for the sale of it, as they say men do in the market, who put up their wares for sale, sometimes for a slight gain, sometimes for sweet and caressing speeches, and sometimes for insecure hopes, founded on no sure ground, and sometimes even for promises which are in no respect better than dreams.