Neither are they all children, because they are the seed of Abraham: but in Isaac shall thy seed be called.
THe particular instance of the true seed of Abraham, cometh now to be stood upon, in that he saith, in Isaac shall thy seed be called, which words are the words of God to Ahraham, in Gen. 21.12. and that place of Genesis considered with this of the Apostle, giveth us to understand the meaning of the words to be this,
Ishmael was Abrahams child as well as Isaac; Ishmael came of Abra∣ham by course of nature, and that as well as Isaac; yet God saith, thy son Ishmael should not be thy son and heir, but told him plainly and directly, that his son Isaac was the child, in whom he would accomplish and make good his Promise, concerning mercy, grace, righteousnesse, and salva∣tion, in him shall thy seed come to participate in the promise, in thy son Isaac.
Now then, the Lord in these words maketh known, that Isaac was the chosen seed of Abraham, that did belong unto Gods election, that he had rejected Ishmael from all eternity, though he was the son of Abraham, and appointed Isaac to life and salvation: And so this example of Isaac, and of Ishmael, doth very well fit the purpose of the Apostle, namely this, to shew that though the Jews come of Abraham, according to the course of Nature, and are his seed by carnal generation, yet are not all such as be∣long unto Gods eternal election, and though they be rejected, there is no breach of the promise of the Lord, of which the Apostle treateth in this Chapter.
Now we are to observe in the first place, touching these words, they being considered, (as you heard) the words of God to Abraham, thus much; That God in these words maketh known unto Abraham, a great difference that was between his two sons, Ishmael and Isaac; such a dif∣ference as Abraham did not think upon, nor could not take notice of, un∣till God did make it known: Abraham without question, did judge both of his sons to be in the same estate; Ishmael, and Isaac, to be in the same condition, and that both had right and title to that Covenant, in Gen. 17.7. I will be thy God, and the God of thy seed. Thus Abraham thought, and therefore Abraham circumcised both his children, yea Ishmael in the first place, and instructed both, and brought them up both alike; yet you see God putteth a wide, and a large difference between them, his sons, Ishmael and Isaac: Isaac was the chosen seed; Ishmael was not; Isaac belonged