 One can respond to arguments of this kind as follows. Assume that if God exists, then this is a best possible  world.[8]  In that case, if God exists, there could not be an evil unless it were necessary for some greater good, in which case any state of affairs containing evil incompatible with there being a maximally good world is impossible. But it be may be assumed that it is not possible for any agent to bring about an impossible state of affairs. Thus, if God exists, any moral evil, that is, any evil brought about by anyone, and any natural evil, or any evil which has an impersonal, natural cause, must be necessary for some greater good.