‘But suppose circumstances are such that observance of one Divine law, say the law against lying, involves breach of some other absolute Divine prohibition?’—If God is rational, he does not command the impossible; if God governs all events by his Providence, he can see to it that circumstances in which a man is inculpably faced by a choice between forbidden acts do not occur. Of course such circumstances (with the clause ‘and there is no way out’ written into their description) are consistently describable; but God’s Providence could ensure that they do not in fact arise. Contrary to what unbelievers often say, belief in the existence of God does make a difference to what one expects to happen.
(Peter Geach, “The Moral Law and the Law of God,” chap. 5 in Absolutism and Its Consequentialist Critics, ed. Joram Graf Haber [Lanham, MD: Rowman & Littlefield Publishers, 1994], 63-72, at 71 [essay first published in 1969])
Note from KBJ: Geach, like his wife, G. E. M. Anscombe (1919-2001), is a moral absolutist. This means that they believe that certain acts, such as killing the innocent, must not be performed, whatever the consequences. Fiat justitia, ruat cœlum. (“Let justice be done, though the heavens fall.”) The standard criticism of moral absolutism is that it is self-indulgent. How could any act be so bad that it must not be performed, even if millions of innocent people should die? Geach’s reply is that God won’t allow situations such as that to arise. Note that only a theist could make this move. An atheistic moral absolutist must bite the bullet.
Note 2 from KBJ: All absolutists are deontologists, but not all deontologists are absolutists. What makes someone a deontologist (as opposed to a consequentialist) is the belief that certain types of act, such as lying, torturing, or killing the innocent, are intrinsically wrong (i.e., wrong in and of themselves, independently of their consequences). Some deontologists (known as absolutists) hold that intrinsically wrong acts must never be performed, no matter how much good would come of it. (“Better two deaths—or even a million deaths—than one murder.”) Other deontologists (known as moderates) hold that intrinsically wrong acts may be performed, provided enough good will come of it. The difference between a moderate deontologist and a consequentialist is that only the former believes that certain acts are intrinsically wrong.