God’s kindness toward you, provided you continue in His kindness; otherwise you also will be cut off.  Romans 11:22

Apostle Paul uses the metaphor of the olive tree, which include its root and branches, to refer to Israel.  The broken branches are the unbelieving Jews and the grafted are the Gentiles who believe in Christ.  Because the Gentiles have been made part of God’s tree due to faith, the Gentile Christians have no reason for pride and are instructed to give kindness and wholehearted helpfulness.  God has a plan that includes the Jews and we are cautioned to exhibit greatest kindness possible to the Jews.

In verse 29 Paul reminds us, ‘the gifts and the calling of God are irrevocable.’  This means that the Jews have been chosen, given the election, and this is unchangable.