You do something because a thought came to you. It came to you because you saw others do something. Since your thought is a product of another’s thought and your action is a product of another’s action, where is the real you in this picture?
This is how we go to sleep to our true Self. We think and act unconsciously, like tennis balls bouncing off somebody else’s racket and wall.
The question is this: if you drop all thoughts, drop all actions, who are you? How do you know that? You cannot understand this by thinking because that will take you away from the answer.