^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.

Abraham was a shining example of faith

¹⁸ Abraham, when hope was dead within him, went on hoping in faith, believing that he would become “the father of many nations”. He relied on the word of God which definitely referred to ‘your descendants’.

^19-22 With undaunted faith he looked at the facts—his own impotence (he was practically a hundred years old at the time) and his wife Sarah’s apparent barrenness. Yet he refused to allow any distrust of a definite pronouncement of God to make him waver. He drew strength from his faith, and while giving the glory to God, remained absolutely convinced that God was able to implement his own promise. This was the “faith” which ‘was accounted to him for righteousness’.