But we see that the child of the slave-girl was born in the common course of nature; but the child of the free woman in fulfilment of the promise.
But what does it say?»The Message is close to you, in your mouth and in your heart;« that is, the Message which we are publishing about the faith–
For it is written that Abraham had two sons, one by the slave-girl and one by the free woman.
Through faith even Sarah herself received strength to become a mother –although she was past the time of life for this– because she judged Him faithful who had given the promise.