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

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.

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

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

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

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.