For this is what the promise declared: “About a year from now I will return and Sarah will have a son.”

Without being weak in faith, he considered his own body as dead (because he was about one hundred years old) and the deadness of Sarah’s womb.

By faith, even though Sarah herself was barren and he was too old, he received the ability to procreate, because he regarded the one who had given the promise to be trustworthy.

like Sarah who obeyed Abraham, calling him lord. You become her children when you do what is good and have no fear in doing so.