Yes, I meant Romans. lol
Was in a little bit of a hurry writing that.
This is gleaned from the context. This whole section is about Israel.
I don't think we should dwell too long on the meaning of charisma, but rather on the context of what Paul is saying. A word's meaning is provided by the way it is used.
"Lest you be wise in your own sight, I do not want you to be unaware of this mystery, brothers: a partial hardening has come upon Israel, until the fullness of the Gentiles has come in.
26And in this way all Israel will be saved, as it is written,
“The Deliverer will come from Zion,
he will banish ungodliness from Jacob”;
27“and this will be my covenant with them
when I take away their sins.”
28As regards the gospel,
they are enemies for your sake. But as regards election,
they are beloved for the sake of
their forefathers.
29For the gifts and the calling of God are irrevocable. Romans 11:25-29 (ESV)
As you can see from the surrounding context, it is clear he is speaking about Israel. He warns them not to be wise in their own sight, to not think too much of themselves as God has a plan for Israel. That though there has been a partial hardening of Israel, there will also come a future salvation. The "they" referenced in v.28 is clearly Israel, and v.29 is an explanation of v.28. Which one is of course to conclude that the gifts and callings specifically being mentioned are those given to Israel, it is an appeal to God's faithfulness as it relates to Israel.
The immediate context is the salvation of Israel, he is not talking about our individual salvation.
"And in this way
all Israel will be saved, as it is written" Romans 11:26 (ESV)
Paul is alluding to God's Covenant faithfulness on account of their forefathers for their future salvation, that though they have fallen, God's gifts and callings are irrevocable and he will bring them back into the fold.
This is summarized in Romans 11:32
For God has consigned all to disobedience, that he may have mercy on all. Romans 11:32 (ESV)
I highly recommend reading Romans 11 a couple times start to finish, even reading Romans 9-11 to gain a fuller context to see what God is talking about. You have to remember that Paul is dealing with the issue of the inclusion of the Gentiles and the faithfulness of God in relation to the rejection of ethnic Israel. They were expecting the Messiah to setup an earthly throne over the kingdom of Israel and save them from Roman occupation, and usher in their concept of the Messianic Age. God had bigger plans, which involved saving the world and thus the cross was a stumbling block to the Jews, as a crucified Messiah is not what they were expecting. These were extremely central issues and at the heart of Paul's message, if we fail to realize how big a deal the inclusion of the Gentiles was then we will misread Paul and the rest of the New Testament.