The development of the meaning attaching to the personal self, the conscious being, is the subject matter of the history of psychology.

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

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 dualism itself becomes a sort of presupposition or datum; its terms condition the further problem.

Heredity provides for the modification of its own machinery.

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