To him who looks upon the world rationally, the world in its turn presents a rational aspect. The relation is mutual.

An idea is always a generalization, and generalization is a property of thinking. To generalize means to think.

The courage of the truth is the first condition of philosophic study.

We learn from history that man can never learn anything from history.

Science and knowledge, especially that of philosophy, came from the Arabs into the West.

The first glance at History convinces us that the actions of men proceed from their needs, their passions, their characters and talents; and impresses us with the belief that such needs, passions and interests are the sole spring of actions.

God is the absolute truth...