Monster
I found this sentence/information in Fassbinder Thousands of Mirrors by Ian Pecman.
The word monster has its etymological roots in the Latin monstrare and French montrer: to show or make apparent.
The association that came to me as I read this is that we all have a monster inside of us; we are all capable of monstrous things (i.e., under the right circumstances, anyone can become a monster).
Psychoanalysis is a lot of different things. One of the ways I’d describe it is a way to try to get to know the monster inside of us.