In so far as we are individuals, each of us is a fragment of a species, a part of this universe, a single dot in the immense network of forces and influences, cosmic, ethnic, historic, whose laws we obey. We are subject to the determination of the physical world. But each man is also a person, he is not subject to the stars and atoms; for he subsists entirely with the very subsistence of his spiritual soul, and the latter is in him a principle of creative unity, of independence and of freedom.

Scholasticism and Politics (1940)