Worrying about what might happen (future), when the moment has not yet come for it to happen, takes away from us the necessary energy to deal with it when it finally arrives. Living in memories drains our energy; the past already happened & no longer exists, except in our memory. We feed memories, not realizing that emerging the memory in our mind distracts us from the present & weakens us. It is like being a plug that connects to a socket with no current passing through. We lose our energy.