Phronimos, possessing practical wisdom . But the only virtue special to a ruler is practical wisdom; all the others must be possessed, so it seems, both by rulers and ruled. The virtue of a person being ruled is not practical wisdom but correct opinion; he is rather like a person who makes the pipes, while the ruler is the one who can play them.

The senses are gateways to the intelligence. There is nothing in the intelligence which did not first pass through the senses.

Life in the true sense is perceiving or thinking.

Anything whose presence or absence makes no discernible difference is no essential part of the whole.

It is no part of a physician's business to use either persuasion or compulsion upon the patients.

At first he who invented any art that went beyond the common perceptions of man was naturally admired by men, not only because there was something useful in the inventions, but because he was thought wise and superior to the rest. But as more arts were invented, and some were directed to the necessities of life, others to its recreation, the inventors of the latter were always regarded as wiser than the inventors of the former, because their branches of knowledge did not aim at utility.

Boundaries don't protect rivers, people do.