22. I cannot do any thing. Since the angel had not only been sent as an avenger to destroy Sodom, but also had received a command for the preservation of Lot; he therefore declares, that he will not do the former act, unless this latter be joined with it; because it is not at the option of the servant to divide those things which God has joined together. I am not, however, dissatisfied with the explanation of some, who suppose the angel to speak in the person of God. For although in appearance the language is harsh, yet there is no absurdity in saying, that God is unable to destroy the reprobate without saving his elect. Nor must we, therefore, deem his power to be limited, when he lays himself under any such necessity; (426) or that anything of his liberty and authority is diminished, when he willingly and freely binds himself. And let us especially remember, that his power is connected by a sacred bond with his grace, and with faith in his promises. Hence it may be truly and properly said, that he can do nothing but what he wills and promises. This is a true and profitable doctrine. There will, however, be less ground of scruple if we refer the passage to the angels; who had a positive commandment, from which it was not lawful for them to abate the smallest portion.
(426) “ Dum sibi ipse est necessitas.” Literally, “When he is his own necessity.”