No, our science is no illusion. But an illusion it would be to suppose that what science cannot give us we can get elsewhere.
Sigmund FreudProperly 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.
Sigmund FreudThere is a powerful force within us, an un-illuminated part of the mind - separate from the conscious mind that is constantly at work molding our thought, feelings, and actions.
Sigmund FreudIn the theory of psycho-analysis we have no hesitation in assuming that the course taken by mental events is automatically regulated by the pleasure principle. We believe, that is to say, that the course of those events is invariably set in motion by an unpleasurable tension, and that it takes a direction such that its final outcome coincides with a lowering of that tension that is, with an avoidance of unpleasure or a production of pleasure.
Sigmund Freud