Those wretches who never have experienced the sweets of wisdom and virtue, but spend all their time in revels and debauches, sink downward day after day, and make their whole life one continued series of errors.

Man is a wingless animal with two feet and flat nails.

The most beautiful motion is that which accomplishes the greatest results with the least amount of effort.

Do thine own work, and know thyself.

[Not enough is known about solid geometry] and for two reasons: in the first place, no government places value on it; this leads to a lack of energy in the pursuit of it, and it is difficult. In the second place, students cannot learn it unless they have a teacher. But then a teacher can hardly be found.

The community which has neither poverty nor riches will always have the noblest principles.

We obtain better knowledge of a person during one hour's play and games than by conversing with him for a whole year