Until you read the text ...
Rom 2
17 But if some of the branches were broken off, and you, being a wild olive (GENTILE) were grafted in among them (JEWS) and became partaker with them of the rich root of the olive tree, 18 do not be arrogant toward the branches; but if you are arrogant, remember that it is not you who supports the root, but the root supports you. 19 You will say then, “Branches were broken off so that I might be grafted in.” 20 Quite right, they (JEWS) were broken off for their unbelief, but you stand by your faith. Do not be conceited, but fear; 21 for if God did not spare the natural branches (Jews), He will not spare you, either. 22 Behold then the kindness and severity of God; to those who fell, severity, but to you, God’s kindness, if you continue in His kindness; otherwise you also will be cut off. 23 And they also, if they do not continue in their unbelief, will be grafted in, for God is able to graft them in again. 24 For if you were cut off from what is by nature a wild olive tree (i.e. - a believing gentile), and were grafted contrary to nature into a cultivated olive tree, how much more will these who are the natural branches be grafted into their own olive tree? .
Guessing again perhaps Romans 11:24 was thought to teach loss of salvation. Here we have the corporately chosen people of Israel (Jews) being hardened to facilitate the spread of the gospel to the Gentiles (non-Jews).
The "you" in the case of vs 22 and 24 is "the gentile believer"
The "these who are natural branches" of vs 24 is unbelieving Jews (not all Jews - for Paul himself is a believing Jew as are all the Apostles)
Rom 2
17 But if some of the branches were broken off, and
you, being a wild olive (GENTILE) were grafted in among them (JEWS) and became partaker with them of the rich root of the olive tree, 18 do not be arrogant toward the branches; but if you are arrogant,
remember that it is not you who supports the root, but the root
supports you. 19 You will say then, “Branches were broken off so that I might be grafted in.” 20 Quite right, they (JEWS) were broken off for their unbelief,
but you stand by your faith. Do not be conceited, but fear; 21 for if God did not spare the natural branches (Jews),
He will not spare you, either. 22 Behold then the kindness and severity of God; to those who fell, severity, but to you, God’s kindness, if you continue in His kindness;
otherwise you also will be cut off. 23 And they also,
if they do not continue in their unbelief, will be grafted in, for God is able to graft them in again. 24 For
if you were cut off from what is by nature a wild olive tree (i.e. - a believing gentile), and were grafted contrary to nature into a cultivated olive tree, how much more will these who are the natural
branches be grafted into their own olive tree?
Were the Jews that were cut off believers? Nope, they were non-believers, and therefore not true Israel. So no loss of salvation under the New Covenant is being taught.
Paul does NOT contrast believing Jews with believing Gentiles in Romans 11... but rather unbelieving Jews with believing gentiles.
And the "
you" who stands only by your faith... is the believing gentile
That is the same "
you who should fear"
but you stand by your faith. Do not be conceited, but fear; 21 for if God did not spare the natural branches (Jews),
He will not spare you, either. 22 Behold then the kindness and severity of God; to those who fell, severity, but
to you, God’s kindness, if you continue in His kindness;
otherwise you also will be cut off.