In recent years, William Lane Craig has vigorously championed a moral argument for God's existence. The backbone of Craig's argument is the claim that only God can provide a ‘sound foundation in reality’ for morality. The present article has three principal aims. The first is to interpret and clarify the account of the ontological foundation of morality proposed by Craig. The second is to press home an important objection to that account. The third is to expose the weakness of Craig's case for saying that without God morality would be groundless and illusory.