The view is often defended that sciences should be built up on clear and sharply defined basal concepts. In actual fact no science, not even the most exact, begins with such definitions. The true beginning of scientific activity consists rather in describing phenomena and then in proceeding to group, classify and correlate them.

I cannot inquire into whether the abolition of private property is expedient or advantageous. But I am able to recognize that the psychological premisses on which the [system]] is based are an untenable illusion. In abolishing private property we deprive the human love of aggression of one of its instruments, certainly a strong one, though certainly not the strongest, but we have not altered the differences in power and influence which are misused by aggressiveness, nor have we altered anything in its nature. Aggressiveness was not created by property. It reigned almost without limit in primitive times, when property was still very scanty, and it already shows itself in the nursery almost before property has given up its primal, anal form; it forms the basis of every relation of affection and love among people (with the single exception, perhaps, of the mother's relations to her male child).

I am actually not at all a man of science, not an observer, not an experimenter, not a thinker. I am by temperament nothing but a conquistador — an adventurer, if you want it translated — with all the curiosity, daring, and tenacity characteristic of a man of this sort.

It would be very nice if there were a God who created the world and was a benevolent providence, and if there were a moral order in the universe and an after-life; but it is a very striking fact that all this is exactly as we are bound to wish it to be.

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The dream shows how recollections of one’s everyday life can be worked into a structure where one person can be substituted for another, where unacknowledged feelings like envy and guilt can find expression, where ideas can be linked by verbal similarities, and where the laws of logic can be suspended.

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.