Knowledge becomes evil if the aim be not virtuous.

Hardly any human being is capable of pursuing two professions or two arts rightly.

Much sleep is not required by nature, either for our souls or bodies, or for the action in which they are concerned.

At the Egyptian city of Naucratis there was a famous old god whose name was Theuth; the bird which is called the Ibis was sacred to him, and he was the inventor of many arts, such as arithmetic and calculation and geometry and astronomy and draughts and dice, but his great discovery was the use of letters.

When a person meets the half that is his very own, whatever his orientation, whether it's to young men or not, then something wonderful happens: the two are struck from their senses by love, by a sense of belonging to one another, and by desire, and they don't want to be separated from one another, not even for a moment.

To be curious about that which is not one's concern while still in ignorance of oneself is ridiculous.

To suffer the penalty of too much haste, which is too little speed.