“the patient does not remember anything of what he has forgotten and repressed, but acts it out. He reproduces it not as a memory but as an action; he repeats it, without of course knowing that he is repeating it.”
Freud, Sigmund (1986) . ‘Remembering, Repeating and Working Through (further recommendations on the technique of psychoanalysis II)’. In The Complete Psychological Works of Sigmund Freud, Volume XII, Standard Edition, pp.145-156. Hogarth Press Limited, UK. Quotation from p150.
“the compulsion to repeat is an ungovernable process originating in the unconscious. As a result of its action, the subject deliberately places himself in distressing situations, thereby repeating an old experience, but he does not recall this prototype”
Laplanche, J. & Pontalis, J.B.  (1988). The Language of Psychoanalysis. Karnac Books, London. P.78.