For this cause it is of faith, that it may be according to grace, to the end that the promise may be sure to all the offspring, not to that only which is of the law, but to that also which is of the faith of Abraham, who is the father of us all.
ExplanationCommentary
Verse 16. There are two kinds of children of Abraham, to whom alone these promises are made; the one is according to the flesh, the other according to the spirit. The former of these had no more part in the promises made to him and his seed than the Gentiles, unless they imitated the fidelity and obedience of their father. Calmet.—It is in this sense of spiritual father, that the priest at the altar, speaking in the name of the faithful, calls Abraham our patriarch. Estius.