If by grace, then it cannot be based on works; if it were, grace would no longer be grace

 Romans 11:1-18

So too, at the present time there is a remnant chosen by grace. And if by grace, then it cannot be based on works; if it were, grace would no longer be grace.

Again I ask: Did they stumble so as to fall beyond recovery? Not at all! Rather, because of their transgression, salvation has come to the Gentiles to make Israel envious. But if their transgression means riches for the world, and their loss means riches for the Gentiles, how much greater riches will their full inclusion bring!

If some of the branches have been broken off, and you, though a wild olive shoot, have been grafted in among the others and now share in the nourishing sap from the olive root, do not consider yourself to be superior to those other branches. If you do, consider this: You do not support the root, but the root supports you.

Why?

Even Gentiles get the salvation because Israel rejects the salvation, but the salvation comes from the Israelites, Abraham. So the Gentiles could not boast, for they received the salvation. If the Israelites receive Jesus Christ as their savior, it will bea  better grace over the whole world.

How?

Be humble and continue seek the Holy life and more faith in Jesus Christ!