Again, the male is by nature superior, and the female inferior; and the one rules, and the other is ruled; this principle, of necessity, extends to all mankind.

Imagination is a sort of faint perception.

It is clear, then, that the earth must be at the centre and immovable, not only for the reasons already given, but also because heavy bodies forcibly thrown quite straight upward return to the point from which they started, even if they are thrown to an infinite distance. From these considerations then it is clear that the earth does not move and does not lie elsewhere than at the centre.

Intuition is the source of scientific knowledge.

Happiness, then, is found to be something perfect and self-sufficient, being the end to which our actions are directed.

He who is unable to live in society, or who has no need because he is sufficient for himself, must be either a beast or a god.

It is evident, then, that there is a sort of education in which parents should train their sons, not as being useful or necessary, but because it is liberal or noble.