We cannot grasp ourselves (?)

If there is an unconscious or subconscious, and it is part of what we are...

then we are already grasping it the same way we are grasping "breathing".

Each part of us may not fully understand the other part, but why would it need to?

Our fingernails may not understand how our heart works, and our conscious mind may not understand how the subconscious works.

But do these parts need an understanding?