In the first place, Descartes stands for the most explicit and uncompromising dualism between mind and matter.

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.

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.

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

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

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

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