These people know that God's decrees require that those who practice such things deserve to die [i.e., either spiritual or temporal punishment], yet they not only do the same things [themselves], but even approve of other people who practice them.

Now if the Jews sinning meant blessings for [the rest of] the world, and their [spiritual] defection meant blessings for the Gentiles, how much more will their fullness [also produce blessings]! [Note: "Fullness" here may mean either a large or the complete number of Jews who will be saved, or become completely obedient to God].

For if God did not spare the natural branches [i.e., the Jews], He will not spare you [Gentiles] either.

For I want you to know this secret, brothers, so you will not become conceited: Part of the Israelites have become [spiritually] insensitive [to God], [and will remain that way] until the fullness of the Gentiles occurs. [Note: As with verse 12, concerning the Jews, "fullness" here may mean either a large or the complete number of Gentiles who will be saved].