<p>It is not the circumstances of life that trouble or weigh upon us, it is the way we take them. If a man is playing a difficult game of chess, the more intricate the moves the more thoughtfully he looks over his own and his opponent's men, and the more fully he is aroused to make the right move toward a checkmate. If, when the game became difficult, the player stopped to be depressed and disheartened, his opponent would probably always che...