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

In the first place, Descartes stands for the most explicit and uncompromising dualism between mind and matter.

Like all science, psychology is knowledge; and like science again, it is knowledge of a definite thing, the mind.

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

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

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

Heredity provides for the modification of its own machinery.