(21) For if the (n) inheritance [be] of the law, [it is] no more of promise: but God gave [it] to Abraham by promise.
(21) An objection: we grant that the promise was not cancelled by the covenant of the Law, and therefore we join the Law with the promise. No, the apostle says, these two cannot stand together, that is, that the inheritance should both be given by the Law and also by promise, for the promise is free. And from this it follows that the Law was not given to justify, for by that means the promise would be broken.
(n) By this word "inheritance" is meant the right of the seed, which is, that God should be our God, that is to say, that by virtue of the covenant that was made with faithful Abraham, we that are faithful might by that means be blessed by God as well as Abraham.