According to Osho, the 'self' as conceived by the mind is only a skillful device—a provisional hypothesis, like 'God'—useful to orient practice but not truth itself. It must be employed fully and then allowed to disappear; clinging turns it into an obstacle. Real self is direct, wordless presence—the 'fourth'—revealed when the idea drops.
The self you think about is like training wheels—use them to learn, then let them fall off so you can simply be.