The Republic by Plato Part 9 Page 37

I cannot myself tell, he said.

Well, but what ought to be the criterion? Is any better than experience and wisdom and reason?

There cannot be a better, he said.

Then, I said, reflect. Of the three individuals, which has the greatest experience of all the pleasures which we enumerated? Has the lover of gain, in learning the nature of essential truth, greater experience of the pleasure of knowledge than the philosopher has of the pleasure of gain?

The philosopher, he replied, has greatly the advantage; for he has of necessity always known the taste of the other pleasures from his childhood upwards: but the lover of gain in all his experience has not of necessity tasted — or, I should rather say, even had he desired, could hardly have tasted —