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

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

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

The dog, on the other hand, has few or no ideas because his brain acts in coarse fashion and because there are few connections with each single process.

Dogs get lost hundreds of times and no one ever notices it or sends an account of it to a scientific magazine.

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

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