The theological justification stems from God's aseity: the non-contingent, independent and self-sustained mode of existence that theologians ascribe to God.[citation needed] For if he was not morally perfect, that is, if God was merely a great being but nevertheless of finite benevolence, then his existence would involve an element of contingency, because one could always conceive of a being of greater benevolence.[8] Hence, omnibenevolence is a requisite of perfect being theology.[9]