The Republic by Plato Part 6 Page 21

that is his nature; he will not rest in the multiplicity of individuals which is an appearance only, but will go on — the keen edge will not be blunted, nor the force of his desire abate until he have attained the knowledge of the true nature of every essence by a sympathetic and kindred power in the soul, and by that power drawing near and mingling and becoming incorporate with very being, having begotten mind and truth, he will have knowledge and will live and grow truly, and then, and not till then, will he cease from his travail.

Nothing, he said, can be more just than such a description of him.

And will the love of a lie be any part of a philosopher’s nature? Will he not utterly hate a lie?

He will.