<p>4:14 <i>For if they that are of the law are heirs, faith is made void, and the promise is made of no power</i><i>- </i>The huge importance attached to faith in Gen. 15:6 would be pointless if obedience to the Law was what guaranteed the promise of inheritance the world- as Jewish theology taught about Abraham. The promise of the Kingdom would become irrelevant because Paul has demonstrated in Romans 1-3 that all men, Abraham included, are sinners, law breakers, and condemned before the judgment seat of God. Nobody would therefore inherit the promised Kingdom, and so the promise of it would have been pointless- see on 4:15.</p>