The guest will judge better of a feast than the cook

The more you know, the more you know you don't know.

... the science we are after is not about mathematicals either none of them, you see, is separable.

They who are to be judges must also be performers.

Friendship is two souls inhabiting one body.

Excellence or virtue in a man will be the disposition which renders him a good man and also which will cause him to perform his function well.

While most of those who hold that the whole heaven is finite say that the earth lies at the center, the philosophers of Italy, the so-called Pythagoreans, assert the contrary. They say that in the middle there is fire, and that the earth is one of the stars, and by its circular motion round the center produces night and day.