Why is [this] so difficult for most people? because most of us were told in childhood that the way to conquer a difficulty is to fight it and demolish it. That theory is, of course, the one that should be taught to young people. Many of the difficulties we encounter in youth are not permanent; and the combination of a heroic courage, a resolute will, and a tireless persistence will often — probably usually — break them down. Bu tin later years the essential elements in the situation change. We find in our little world prison-walls which no amount of battering will demolish. Within those walls we must spend our day — spend them happily, or resentfully. Under these new circumstances we must deliberately reverse our youthful technique. We must gain victory, not by assaulting the walls, but by accepting them. Only when this surrender is made can we assure ourselves of inward quietness, and locate the net step on the road to ultimate victory.
How Not to Worry: A 1934 Guide to Mastering Life