As Abraham believed God, and it was accounted to him for righteousness:

so hence ye know, that it is they who believe who are the children of Abraham.

and the scripture insinuating, that God would justify the Gentiles thro' faith, gave Abraham an intimation of the gospel in these words, " in thee shall all nations be blessed."

so that it is they who believe, who are blessed with Abraham, who did believe.

that the blessing promised to Abraham might come on the Gentiles thro' Jesus Christ; that we by believing might receive the spirit that was promised.

now to Abraham and his offspring were the promises made. he does not say, "to offsprings," as if he spoke of many; but as speaking of one, "and to thy offspring," which means Christ.

now if the right to the inheritance be from the law, it is no longer founded upon the promise; altho' God made a donation of it to Abraham by promise.

and if you belong to Christ, you are Abraham's offspring, and his heirs by virtue of the promise.

for it is there written, Abraham had two sons, the one by a bond-maid, the other by a free-woman.