Like all science, psychology is knowledge; and like science again, it is knowledge of a definite thing, the mind.

Psychology is the Science of Mental Life, both of its phenomena and their conditions.

Perhaps home is not a place but simply an irrevocable condition.

Science should leave off making pronouncements: the river of knowledge has too often turned back on itself.

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

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