Don’t plan (take no thought for tomorrow). Don’t think before you act. Act—and correct your actions as you go along. This advice may seem radical, yet it is actually the way all servo-mechanisms must work. A torpedo does not “think out” all its errors in advance, and attempt to correct them in advance. It must act first—start moving toward the goal—then correct any errors which may occur. “We cannot think first and act afterwards,” said A. N. Whitehead. “From the moment of birth we are immersed in action, and can only fitfully guide it by taking thought.”