The Spirit is an ethereal entity. It requires to establish a connection with the Energy in order to get energized and maintain its subtlety. Turning away from the Energy hardens the spirit. It becomes unappreciative of the metaphysical Reality.
The spiritual Heart is like a mirror, from which the Eternal Energy reflects. By neglecting the spirit, we cripple our spiritual abilities and become oblivious of the Truth. It is not the eyes, but the hearts that go blind.