However, the son by the handmaid was born according to the flesh, but the son by the free woman was born through promise.
But what does it say? *The word is near you, in your mouth, and in your heart;* that is, the word of faith, which we preach:
For it is written that Avraham had two sons, one by the handmaid, and one by the free woman.
By faith, even Sarah herself received power to conceive, and she bore a child when she was past age, since she counted him faithful who had promised.