Romans 11:24 - Joseph Benson’s Commentary on the Old and New Testaments

For, &c. As if he had said, And it appears that he will do it, because he has done that which was more unlikely, as being contrary to nature: if thou wert cut out of the tree wild by nature, &c. If thou wert admitted into the family of God, though descended from parents that were strangers and enemies, how much more shall they who were children of the covenant, to whom the promises originally belonged, be taken into covenant with him. In other words, God will not seem to do so wonderful a thing, in restoring them to what might appear the privilege of their birthright, and in saving the seed of Abraham his friend, as he hath done in calling you sinners of the Gentiles, to participate the blessings of which you had not the least notion, and to which you cannot be supposed to have had any imaginable claim. This reasoning is certainly very just; the conversion of the Jews, though it hath not yet happened, appearing much more probable than did the conversion of the Gentiles, before that event took place. Some understand the expression, grafted contrary to nature, as signifying contrary to the usual way of ingrafting; which is, not to insert a wild scion into a good stock, but a good scion into a wild stock, to which it communicates its changing efficacy, causing it to bear good fruit. But that circumstance appears not to have been at all regarded by the apostle; nor was it necessary, as Doddridge justly observes, that the simile taken from ingrafting should hold in all its particulars: and certainly the engagement to humility arises, in a considerable degree, from the circumstances of the ingrafting here supposed being the reverse of that commonly used. Indeed, had the scion been nobler than the stock into which it was inserted, its dependance on it for life and nourishment would have rendered it unreasonable that it should boast against it; how much more when the case was the reverse of that in use, and the wild olive was ingrafted on the good.