Sigmund Freud

Human beings have made such strides in controlling the forces of nature that, with the help of these forces, they will have no difficulty in exterminating one another, down to the last man. They know this, and it is this knowledge that accounts for much of their present disquiet, unhappiness and anxiety.
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Sigmund Freud, the father of psychoanalysis, was a physiologist, medical doctor, psychologist and influential thinker of the early twentieth century.
Civilisation and its Discontents (1930)