Romans 11:15 Meaning

13For I speak to you Gentiles, inasmuch as I am the apostle of the Gentiles, I magnify mine office:

14If by any means I may provoke to emulation them which are my flesh, and might save some of them.

15For if the casting away of them be the reconciling of the world, what shall the receiving of them be, but life from the dead?

16For if the firstfruit be holy, the lump is also holy: and if the root be holy, so are the branches.

17And if some of the branches be broken off, and thou, being a wild olive tree, wert graffed in among them, and with them partakest of the root and fatness of the olive tree;