(6) For this [is] the word of promise, At this time will I come, and Sara shall have a son.
(6) A reason of that application: because Isaac was born by the power of the promise, and therefore he was not chosen, no, he was not at all, except by the free will of God: by which it follows that the promise is the fountain of predestination, and not the flesh, from which promise the particular election proceeds, that is, that the elect are born elect, and not that they are first born, and then after elected, by God who predestinates.