But the child of the slave-woman was born in the course of nature, while the child of the free woman was born in fulfillment of a promise.
No, but what does it say? 'The Message of Faith' which we proclaim.
Scripture says that Abraham had two sons, one the child of the slave-woman and the other the child of the free woman.
Again, it was faith that enabled Sarah to conceive (though she was past the age for child-bearing), because she felt sure that he who had given her the promise would not fail her.