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

It is no wonder if, under the pressure of these possibilities of suffering, men are accustomed to moderate their claims to happiness - just as the pleasure principle itself, indeed, under the influence of the external world, changed into the more modest reality principle -, if a man thinks himself happy merely to have escaped unhappiness or to have survived his suffering, and if in general the task of avoiding suffering pushes that of obtaining pleasure into the background.

The interpretation of dreams is the royal road to a knowledge of the unconscious activities of the mind.

If one wishes to form a true estimate of the full grandeur of religion, one must keep in mind what it undertakes to do for men. It gives them information about the source and origin of the universe, it assures them of protection and final happiness, and it guides - by - precepts - backed by the full force of its authority.

Religious doctrines … are all illusions, they do not admit of proof, and no one can be compelled to consider them as true or to believe in them.

The idea of life having a purpose stands and falls with the religious system.

The genitals themselves have not undergone the development of the rest of the human form in the direction of beauty.