The materialistic point of view in psychology can claim, at best, only the value of an heuristic hypothesis.

Child psychology and animal psychology are of relatively slight importance, as compared with the sciences which deal with the corresponding physiological problems of ontogeny and phylogeny.

Contractile movements arise, sometimes at the instigation of external stimuli but sometimes also in the absence of any apparent external influence.

There are other sources of psychological knowledge, which become accessible at the very point where the experimental method fails us.

Now the word-symbols of conceptual ideas have passed so long from hand to hand in the service of the understanding, that they have gradually lost all such fanciful reference.

The old metaphysical prejudice that man 'always thinks' has not yet entirely disappeared. I am myself inclined to hold that man really thinks very little and very seldom.

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