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

Heredity provides for the modification of its own machinery.

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

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

The reason of the close concurrence between the individuals progress and that of the race appears, therefore, when we remember the dependence of each upon the other.

All along we find that social life - religion, politics, art - reflects the stages reached in the development of the knowledge of self; it shows the social uses made of this knowledge.

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