system
Given the following post, respond as if you're commenting on Reddit:
human
Which thinker speaks about the fact that humans have to decipher themselves instead of merely know themselves?

Psychoanalysis has taught us that we have deeper levels of character that unconsciously motivate us to act. We have repressed traumas that shape the way we behave. We have instincts that spark without the knowledge, will or consent of the self.  We need to go on self-exploration in order to understand the way that our feelings, behaviour and thoughts systems work. The knowledge is not just there in our mind, accessible for us to touch.

It seems that we cannot access the knowledge of ourselves with certainty. We are guessing and second guessing the sources of our feelings and motivations, and constantly building a self-knowledge hub with probable explanations of our behaviours and feelings, a hub that helps us to understand why we feel the way we feel.

Which thinker speaks about that? In the sense that the self (as in the cogito) is detached not just from the Cartesian body, but also from its instincts, unconscious parts and any type of motivation or behaviour which are not clearly chosen and understandable by the cogito itself, where this whole mental structure is alien to us as the outer world itself?
gpt
I think Nietzsche was one of, if not the first to recognize this in opposition to the Catesian view. He says it explicitly in the "Genealogy of Morals" in which he says "we are unknown to ourselves, we knowers" as the first line of the book.