The division of the psychical ...

The division of the psychical into what is conscious and what is unconscious is the fundamental premise of psycho-analysis; and it alone makes it possible for psycho-analysis to understand the pathological processes in mental life, which are as common as they are important, and to find a place for them in the framework of science.
The division of the psychical into what is conscious and what is unconscious is the fundamental premise of psycho-analysis; and it alone makes it possible for psycho-analysis to understand the pathological processes in mental life, which are as common as they are important, and to find a place for them in the framework of science.
 Sigmund Freud

Quotes from the same author

What a distressing contrast there is between the radiant intelligence of the child and the feeble mentality of the average adult.
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 Sigmund Freud
The most complicated achievements of thought are possible without the assistance of consciousness.
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 Sigmund Freud
Being entirely honest with oneself is a good exercise.
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 Sigmund Freud
From error to error one discovers the entire truth.
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 Sigmund Freud
It is impossible to escape the impression that people commonly use false standards of measurement — that they seek power, success and wealth for themselves and admire them in others, and that they underestimate what is of true value in life.
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 Sigmund Freud