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

As everyone knows, the ancients before Aristotle did not consider the dream a product of the dreaming mind, but a divine inspiration, and in ancient times the two antagonistic streams, which one finds throughout in the estimates of dream life, were already noticeable. They distinguished between true and valuable dreams, sent to the dreamer to warn him or to foretell the future, and vain, fraudulent, and empty dreams, the object of which was to misguide or lead him to destruction.

I regard myself as one of the most dangerous enemies of religion

Words have a magical power. They can either bring the greatest happiness or the deepest despair.

No, our science is no illusion. But an illusion it would be to suppose that what science cannot give us we can get elsewhere.

Properly speaking, the unconscious is the real psychic; its inner nature is just as unknown to us as the reality of the external world, and it is just as imperfectly reported to us through the data of consciousness as is the external world through the indications of our sensory organs.

The voice of reason is small, but very persistent.