Plato stands for the union of truth and goodness in the supreme idea of God.
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.
Psychology more than any other science has had its pseudo-scientific no less than its scientific period.
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.
Like all science, psychology is knowledge; and like science again, it is knowledge of a definite thing, the mind.
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.
Feeling is the consciousness of the resulting conditions - of success, failure, equilibrium, compromise or balance, in this continuous rivalry of ideas.