These issues are related to the concept of theodicy, which attempts to answer the question of the problem of evil that is summed up by three statements: God is good, God is omnipotent and omniscient, and there is evil. The existence of evil is usually accepted as a given. If God is good, but not omnipotent, he wants to stop evil but cannot. If God is omnipotent, but not good, he could stop evil but would not. In the Judeo-Christian system, however, God is understood to be both good and omnipotent, so some other answer for the existence of evil is necessary.