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.

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

The development of the meaning attaching to the personal self, the conscious being, is the subject matter of the history of psychology.

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.

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.

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

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