The prehistorical and primitive period represents the true infancy of the mind.

Pythagoras took the next important step by subordinating the mere matter of nature to its essential principle of form and order, identifying the latter with reason or the soul.

Psychology more than any other science has had its pseudo-scientific no less than its scientific period.

The fact that tradition hinders the individual savage from thinking logically by no means proves that he cannot think logically.

Heredity provides for the modification of its own machinery.

The dualism itself becomes a sort of presupposition or datum; its terms condition the further problem.

In Socrates' thought the two marks of individual self-consciousness appear; it is practical and it is social.