Freud published The Interpretation of Dreams in 1900. It introduced the notion that there existed certain predictable and identifiable processes by which dreams were formed.
Dream study impacts culture. We are put in touch with the inner poet who dreams. We hear our inner subjective response to the outer world. That helps spiritualize our lives.
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It is easier to learn to interpret dreams if you have a reason to use them for something constructive. You apply your dream insights to making constructive changes in your life.