He who learns and runs away, lives to learn another day.

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.

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

To the intelligent man with an interest in human nature it must often appear strange that so much of the energy of the scientific world has been spent on the study of the body and so little on the study of the mind.

Human education is concerned with certain changes in the intellects, characters and behavior of men, its problems being roughly included under these four topics: Aims, materials, means and methods.

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