The greatest penalty of evil-doing is to grow into the likeness of a bad man.

What a poor appearance the tales of poets make when stripped of the colours which music puts upon them, and recited in simple prose.

The one who learns and learns and doesn't practice is like the one who plows and plows and never plants.

The cure of many diseases is unknown to physicians because they are ignorant of the whole... For the part can never be well unless the whole is well.

Wisdom alone is the science of others sciences.

Whence comes war and fighting, and factions? Whence but from the body and the lust of the body? Wars are occasioned by the love of money, and money has to be acquired for the same and service of the body.

It was Plato, according to Sosigenes, who set this as a problem for those concerned with these things, through what suppositions of uniform and ordered movements the appearances concerning the movements of the wandering heavenly bodies could be preserved.