Heredity provides for the modification of its own machinery.

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

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

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

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

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

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