Think of the mind as a river: the faster it flows, the better it keeps up with the present and responds to change. The faster it flows, also the more it refreshes itself and the greater its energy. Obsessional thoughts, past experiences (whether traumas or successes), and preconceived notions are like boulders or mud in this river, settling and hardening there and damming it up. The river stops moving; stagnation sets in. You must wage constant war on this tendency in the mind.
