The father of Psychoanalysis, Sigmund Freud, made the following statement.  It is relevant to the Mnemodynamic process:-

“In the end, if the situation of repression can be successfully reproduced in his memory, his compliance will be brilliantly rewarded.  The whole difference between his age then and now works in his favour; and the thing from which his childish ego fled in terror will often seem to his adult and strengthened ego no more than child’s play”;.
(Sigmund Freud, ‘The Question of Lay Analysis’, 1926)

Freud also said:-

".... we are of opinion that the psychical trauma or the memory of it acts as a kind of foreign body constituting an effective agent in the present even long after it first penetrated ...

"The discovery that we made, at first to our own great surprise, was that when we had succeeded in bringing the exciting event to clear recollection and had also succeeded in arousing with it the accompanying affect, and when the patient had related the occurrence in as detailed a manner as possible and had expressed his feeling in regard to it in words, the various hysterical symptoms disappeared at once, never to return. Recollection without affect is nearly always quite ineffective; the original psychical process must be repeated as vividly as possible, brought into statum nascondi and then 'talked out'. In the case of excitation phenomena ... the symptoms appear again during this repetition in full intensity and then disappear for ever...."
(Freud S. and Breuer J. "On the Psychical Mechanism of Hysterical Phenomena" (1893) from Sigmund Freud, 'Collected Papers', Vol 1. (1924), Hogarth Press, London (first published in the Neurologisches Zentralblatt, 1893, nos 1&2. [Translated by John Rickmann] )