The Republic by Plato Part 6 Page 50

for the sake of knowledge, while they look coldly on the subtleties of controversy, of which the end is opinion and strife, whether they meet with them in the courts of law or in society.

They are strangers, he said, to the words of which you speak.

And this was what we foresaw, and this was the reason why truth forced us to admit, not without fear and hesitation, that neither cities nor States nor individuals will ever attain perfection until the small class of philosophers whom we termed useless but not corrupt are providentially compelled, whether they will or not, to take care of the State, and until a like necessity be laid on the State to obey them; or until kings, or if not kings, the sons of kings or princes, are divinely inspired with a true love of true philosophy.