We speak of virtue, honour, reason; but our thought does not translate any one of these concepts into a substance.

The general statement that the mental faculties are class concepts, belonging to descriptive psychology, relieves us of the necessity of discussing them and their significance at the present stage of our inquiry.

The distinguishing characteristics of mind are of a subjective sort; we know them only from the contents of our own consciousness.

The results of ethnic psychology constitute, at the same time, our chief source of information regarding the general psychology of the complex mental processes.

In Aristotle the mind, regarded as the principle of life, divides into nutrition, sensation, and faculty of thought, corresponding to the inner most important stages in the succession of vital phenomena.

Now, there are a very large number of bodily movements, having their source in our nervous system, that do not possess the character of conscious actions.