A wise ignorance is an essential part of knowledge.

A tyrant... is always stirring up some war or other, in order that the people may require a leader.

Love is a severe mental disorder.

Mankind will never see an end of trouble until lovers of wisdom come to hold political power, or the holders of power become lovers of wisdom

[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.

I do believe that there are gods, and in a far higher sense than that in which any of my accusers believe in them.

A state arises,as I conceive,out of the needs of mankind;no one is self-sufficing,but all of us have many wants