[The child] takes his play very seriously and he expends large amounts of emotion on it. The opposite of play is not what is serious but what is real.

We choose not randomly each other. We meet only those who already exists in our subconscious.

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.

Knowledge is the intellectual manipulation of carefully verified observations.

The inclination to aggression constitutes the greatest impediment to civilization.

The psychoanalysis of neurotics has taught us to recognize the intimate connection between wetting the bed and the character trait of ambition.

Man has, as it were, become a kind of prosthetic God.