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Gregory's second main contribution is his spiritual theology. He is the first Christian [[theologian]] to argue for the infinity of God. [[Origen]], often called a major influence on Gregory, had explicitly argued that God is limited, an essential notion in Platonism, since to be limited is to be clearly defined and knowable. Gregory, however, argues that if God is limited he must be limited by something greater than himself; he is therefore without boundaries. The idea had already been developed by neoplatonic philosophers, especially Plotinus, another important influence on Gregory, but he is the first Christian to defend it, apart from some hints in the work of [[Irenaeus of Lyons|Irenaeus]].