Chapter VI

The true danger of every form of mental exercise is the addition of worry. Laborious mental exercise is healthy unless it be made anxious by necessary or unnecessary difficulties. Regular mental labour is best carried on by introducing into it some variety. New work gives time for repair better than attempt at complete rest, since the active mind finds it impossible to evade its particular work unless its activity be diverted into some new channel. During the new work a fresh portion of the brain comes into play and the overwrought seat of mental faculty is secured repose and recovery. Excessive competition in mental labour is ruinous at all ages of life.