It can be safely said that Sigmund Freud's theories still hold considerable sway over psychology as we know it.
He developed psychoanalysis, among other theories on child sexuality, the ego and libido which were both largely appreciated as well as critiqued in equal measure. There's no denying however, that the psychoanalyst had an uncanny perception into the intricate workings of the human mind. Here are some quotes by the influential psychoanalyst which pierce straight through the eye of truth.
Gets you thinking.
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