Nowhere more truly than in his mental capacities is man a part of nature.

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.

The un-conscious distortion of the facts is almost harmless compared to the unconscious neglect of an animal's mental life until it verges on the unusual and marvelous.

Success or failure in business is caused more by the mental attitude even than by mental capacities.

Nowhere can man find a quieter or more untroubled retreat than in his own soul.

It will, of course, be understood that directly or indirectly, soon or late, every advance in the sciences of human nature will contribute to our success in controlling human nature and changing it to the advantage of the common weal.