Romans 4:16 : For this cause it is of faith, that it may be according to grace; to the end that the promise may be sure to all the seed; not to that only which is of the law, but to that also which is of the faith of Abraham, who is the father of us all. The promised inheritance, in which Christians share, is of faith, instead of through the righteousness of law, that it may be according to grace. If the promise had been made on the condition that people keep the law, it would not have been sure to any one, for no one kept the law. And, had any one kept the law perfectly and thereby come into the inheritance, it would not have been by grace, but by merit. But as it is, the promise extends to all who are of the faith of Abraham, whether they be Jews or Gentiles.