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.

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

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

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

Heredity provides for the modification of its own machinery.

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.