^16-17 The whole thing, then, is a matter of faith on man’s part and generosity on God’s. He gives the security of his own promise to all men who can be called “children of Abraham”, i.e. both those who have lived in faith by the Law, and those who have exhibited a faith like that of Abraham. To whichever group we belong, Abraham is in a real sense our father, as the scripture says: ‘I have made you a father of many nations’. This faith is valid because of the existence of God himself, who can make the dead live, and speak his Word to those who are yet unborn.