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.

Heredity provides for the modification of its own machinery.

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

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

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

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