Then what should he do? He should first weigh and measure the impulses that come to him. Instead of throwing the impulse out automatically he should first weigh it, analyze it, measure it, and use it to the best advantage in life. A stone is not only used to break another person's head or to break one's own head, but is also used to build houses. Use everything where it will be most useful, where it will be of some advantage. All such things as passion and anger and irritation one looks upon as very bad, as evil; but if that evil were kept in hand it could be used for a good purpose, because it is a power, it is an energy. In other words evil, properly used, becomes a virtue; and virtue wrongly used becomes an evil. For instance, when a person is in a rage, or when he really feels like being angry, if he controls that thought and does not express it in words, that gives him great power. Otherwise the expression has a bad effect upon his nerves. His control of it has given him an extra strength which will remain with him. A person who has anger and control is to be preferred to the person who has got neither.