Philebus (58)

Soc. Clearly anybody can recognize the art I mean; for I am confident that all men who have any intellect whatsoever believe that the knowledge which has to do with being, reality, and eternal immutability is the truest kind of knowledge. What do you think, Protarchus?

Pro. I have often heard Gorgias constantly maintain that the art of persuasion surpasses all others for this, he said, makes all things subject to itself, not by force, but by their free will, and is by far the best of all arts; so now I hardly like to oppose either him or you.

Soc. It seems to me that you wanted to speak and threw down your arms out of modesty.

Pro. Very well; have it as you like.

Soc. Is it my fault that you have misunderstood?

Pro. Misunderstood what?

Soc. My question, dear Protarchus, was not as yet what art or science surpasses all others by being the greatest and best and most useful to us: what I am trying to find out at present is which art, however little and of little use, has the greatest regard for clearness, exactness, and truth. See; you will not make Gorgias angry if you grant that his art is superior for the practical needs of men, but say that the study of which I spoke is superior in the matter of the most perfect truth, just as I said in speaking about the white that if it was small and pure it was superior to that which was great but impure. Now, therefore, with careful thought and due consideration, paying attention neither to the usefulness nor to the reputation of any arts or sciences, but to that faculty of our souls, if such there be, which by its nature loves the truth and does all things for the sake of the truth, let us examine this faculty and say whether it is most likely to possess mind and intelligence in the greatest purity, or we must look for some other faculty which has more valid claims.

Pro. I am considering, and I think it is difficult to concede that any other science or art cleaves more closely to truth than this.