"Climbing to my mind finds its chief justification as an antidote for modern city life. One cannot sweat and worry simultaneously. The mountain resolves itself into a series of simple problems, unconfused by other issues. Its problems are solid rock, to be wrestled with physically; and in the sheer exuberance of thinking through his fingers and toes as his primaeval fathers did before him the climber's worries vanish, sweated from his system, leaving his brain free to appreciate beauty."