The reason of the close concurrence between the individual's 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.

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.

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.

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

Plato stands for the union of truth and goodness in the supreme idea of God.

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

In Socrates' thought the two marks of individual self-consciousness appear; it is practical and it is social.