Restraint and moderation are both rational controls on personal desires. Desire is like seawater; the more you drink, the thirstier you become. So the so-called need for moderation in dealing with people in the world actually refers practically to restraining one's desires, not indulging them, not doing whatever one wants to do.
Holding power in the hands of those in high positions, often forget, to say instead of the law. Overnight wealth of millions of people, most of them throw a lot of money, with money to open the way. In fact, these behaviors are in the indulgence, is in the destruction of their own. A very simple truth: the human desire for food and color can be called the fundamental desire, if you have no restraint to indulge themselves, overeating, uncontrolled gluttony; if you love every day, day orgasm, I believe that, in a short time, you have to say goodbye to health.
Sima Guang said that it is easy to go from frugality to extravagance and difficult to go from extravagance to frugality. He used such a frugal attitude to live in the world, and also borrowed from the past to write a "Ziji Tongjian". American novel "Shogun", Tokugawa Ieyasu as the prototype of the shape of the General Toranaga, is a model of great restraint: each of his expenses, are drawn up in the heart of an amount, but when he told his subordinates to carry out, it is always reduced by half - only such moderation, in order to finally win the Shogunate struggle, the fact is also the case. This is also the case.