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

Heredity provides for the modification of its own machinery.

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

Feeling is the consciousness of the resulting conditions - of success, failure, equilibrium, compromise or balance, in this continuous rivalry of ideas.

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.