'Grafted' in the Bible

Now if some of the branches were broken off, and you, [although you] were a wild olive tree, were grafted in among them and became a sharer of the root of the olive tree's richness,

Then you will say, "Branches were broken off in order that I could be grafted in."

And those also, if they do not persist in unbelief, will be grafted in, because God is able to graft them in again.

For if you were cut off from what is by nature a wild olive tree, and contrary to nature were grafted into a cultivated olive tree, how much more will these who are {natural branches} be grafted into their own olive tree?