John Chrysostom
But if you seek the order of events and the sequence of conclusions, you have in yourself a fully sufficient example. "For if you," says the Apostle, "were cut out of the olive tree that is wild by nature, and contrary to nature were grafted into a good olive tree, how much more will these, who are natural branches, be grafted into their own olive tree?"
If faith was able to produce what is not according to nature, much more will it produce what is according to nature. If the Gentile, cut off from his natural parents, was joined to Abraham contrary to nature, much more can you receive what is your own.
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Evil belongs to the Gentile by nature, since by nature he was a wild olive tree. Good is not in his nature, and he was grafted into Abraham contrary to nature. But to you, on the contrary, good belongs by nature. If you wish to return, you will be established not on another's root, as the Gentile is, but on your own.
Can you then be worthy of any excuse, when what was not in the Gentile's nature became possible for him, while you were unable to do what is in your nature, and even destroyed it?
Then, since the Apostle said, "contrary to nature," and, "you were grafted in," lest you think that the Jew has some advantage over you, he again removes this conclusion by saying that the Jew also will be grafted in.
"How much more will these," he says, "who are natural branches, be grafted into their own olive tree?" And again: "God is able to graft them in." Above he said: "If they do not continue in unbelief, they will be grafted in" (Rom 11:23).
Whenever you hear the Apostle constantly using the expressions "contrary to nature" and "according to nature," do not think that he means here an unalterable nature. By these terms he signifies both what is fitting and corresponding, and what is unfitting to nature. It is not natural actions that are good or evil, but actions of mind and will. Notice also how the Apostle softens his discourse.