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

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

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

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

For origin and development of human faculty we must look to these processes of association in lower animals.

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

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.