The Republic by Plato Part 6 Page 69

other things become useful and advantageous only by their use of this. You can hardly be ignorant that of this I was about to speak, concerning which, as you have often heard me say, we know so little; and, without which, any other knowledge or possession of any kind will profit us nothing.

Do you think that the possession of all other things is of any value if we do not possess the good? or the knowledge of all other things if we have no knowledge of beauty and goodness?

Assuredly not.

You are further aware that most people affirm pleasure to be the good, but the finer sort of wits say it is knowledge?

Yes.

And you are aware too that the latter cannot explain what they mean by