So the state founded on natural principles is wise as a whole in virtue of the knowledge inherent in its smallest constituent class, which exercises authority over the rest. And the smallest class is the one which naturally possesses that form of knowledge which alone of all others deserves the title of wisdom.

The orators and the despots have the least power in their cities ... since they do nothing that they wish to do, practically speaking, though they do whatever they think to be best.

To think truly is noble and to be deceived is base.

Is it not also true that no physician, in so far as he is a physician, considers or enjoins what is for the physician's interest, but that all seek the good of their patients? For we have agreed that a physician strictly so called, is a ruler of bodies, and not a maker of money, have we not?

Arithmetic is a kind of knowledge in which the best natures should be trained, and which must not be given up.

Knowledge is true opinion.

The soul of him who has education is whole and perfect and escapes the worst disease, but, if a man's education be neglected, he walks lamely through life and returns good for nothing to the world below.