Those who live as though God sets the rules are not going by their own rules. That is the self-sacrifice, or selflessness, that peace more often than not requires. Those who insist on going by their own rules cannot make that sacrifice. They are the steady adherents of (global) conflict because they are forever fighting both themselves and others to do whatever they think that they want to do.
It is easier to tell a person what life is not, rather than to tell them what it is. A child understands weeds that grow from lack of attention, in a garden. However, it is hard to explain the wild flowers that one gardener calls weeds, and another considers beautiful ground cover.