The unthought known

There is a very strange concept now in psychoanalysis called
” the unthought known”,
I think it refers to something in the patient which they experienced and so know but they had not then learned words ,so if it was too painful it constantly bothers them  yet they can’t explain it or tell anyone.This is why psychoanalysis takes so long and even then I am unsure if a therapist can supply what the mother couldn’t
Perhaps if we know that we will never understand some of our feelings and worries but can accept them even if we don’t want to. then we can live with them