But he who was of the bondwoman was born after the flesh; but he of the free woman was by promise.
But what says it? The word is near you, even in your mouth, and in your heart: that is, the word of faith, which we preach;
For it is written, that Abraham had two sons, the one by a bondmaid, the other by a free woman.
Through faith also Sara herself received strength to conceive, and was delivered of a child when she was past age, because she judged him faithful who had promised.