All that exists, exists in some amount and can be measured.

On the whole, the psychological work of the last quarter of the nineteenth century emphasized the study of consciousness to the neglect of the total life of intellect and character

Nowhere more truly than in his mental capacities is man a part of nature.

Psychology is the science of the intellects, characters and behavior of animals including man.

It will of course, be understood that directly or indirectly, soon or late, every advance in the sciences of human nature will contribute to our success in controlling human nature and changing it to the advantage of the common wheel.

Just as the science and art of agriculture depend upon chemistry and botany, so the art of education depends upon physiology and psychology.

Amongst the minds of animals that of man leads, not as a demigod from another planet, but as a king from the same race.