But, perhaps, you bear the name of 'Jew,' and are relying upon Law, and boast of belonging to God, and understand his will,

If he was pronounced righteous as the result of obedience, then he has something to boast of. Yes, but not before God.

Though he was nearly a hundred years old, yet his faith did not fail him, even when he thought of his own body, then utterly worn out, and remembered that Sarah was past bearing children.

Now to him who is able to strengthen you, as promised in the Good News entrusted to me and in the proclamation of Jesus Christ, in accordance with the revelation of that hidden purpose, which in past ages was kept secret but now has been revealed