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.

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

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.

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

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

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.