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

From the lowest animals of which we can affirm intelligence up to man this type of intellect is found.

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.

Psychology helps to measure the probability that an aim is attainable.

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

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

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