It is a science and an art to understand the nature of the human ego and to train it. One can understand the nature of the human ego by a study of human nature; but one can learn the way of training it by training one's own ego. Man can train his ego by being patient with all around him that has a jarring effect upon him. For every jar upon the soul irritates the ego. When man expresses his irritation he develops a disagreeable nature; when he controls it and does not express it, then he becomes crushed inwardly. The idea is to rise above all such irritations.