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

Whatever exists at all exists in some amount. To know it thoroughly involves knowing its quantity as well as its quality.

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

Colors fade, temples crumble, empires fall, but wise words endure.

The intellectual evolution of the race consists in an increase in the number, delicacy, complexity, permanence and speed of formation of such associations.

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

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.