Let men of all ranks whether they are successful, or unsuccessful, whether they triumph or not; let them do their duty, and rest satisfied.

Ideas are the source of all things

A drunkard is unprofitable for any kind of good service.

I exhort you also to take part in the great combat, which is the combat of life, and greater than every other earthly conflict.

He is unworthy of the name of man who is ignorant of the fact that the diagonal of a square is incommensurable with its side.

[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.

Perfect wisdom has four parts: Wisdom, the principle of doing things aright. Justice, the principle of doing things equally in public and private. Fortitude, the principle of not fleeing danger, but meeting it. Temperance, the principle of subduing desires and living moderately.