Metaphysics involves intuitive knowledge of unprovable starting-points concepts and truth and demonstrative knowledge of what follows from them.

It [Justice] is complete virtue in the fullest sense, because it is the active exercise of complete virtue; and it is complete because its possessor can exercise it in relation to another person, and not only by himself.

We are what we frequently do.

Men pay most attention to what is their own: they care less for what is common; or, at any rate, they care for it only to the extent to which each is individually concerned.

We should venture on the study of every kind of animal without distaste; for each and all will reveal to us something natural and something beautiful.

People never know each other until they have eaten a certain amount of salt together.

The mass of mankind are evidently slavish in their tastes, preferring a life suitable to beasts.