Why not? Because they did not pursue it on the basis of faith, but as if it were based on achievements. They stumbled over the stone that causes people to stumble.
For the promise that he would inherit the world did not come to Abraham or to his descendants through the Law, but through the righteousness produced by faith.
What can we say, then? Gentiles, who were not pursuing righteousness, have attained righteousness, a righteousness that comes through faith.
But the righteousness that comes from faith says, "Do not say in your heart, "Who will go up to heaven?' (that is, to bring the Messiah down),