Heredity provides for the modification of its own machinery.

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

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.

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.

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

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