In the last analysis the entire field of psychology may reduce to biological electrochemistry.

It is a predisposition of human nature to consider an unpleasant idea untrue, and then it is easy to find arguments against it.

Dogs love their friends and bite their enemies, quite unlike people, who are incapable of pure love and always have to mix love and hate.

From error to error one discovers the entire truth.

Religion belonged to the infancy of humanity. Now that humanity had come of age, it should be left behind.

The whole life of instinct serves the one end of bringing about death.

If children could, if adults knew.