As the apostle instructed weak Christians not to judge their brothers on practices which are neither commanded nor forbidden in Scripture, and as he admonished those who were strong in their faith not to look down upon those who were still learning the distinction, he shared a familiar phrase from God’s Word in Isaiah. He said, “It is written: “‘As surely as I live,’ says the Lord, ‘every knee will bow before me; every tongue will confess to God.’” So why did Paul choose to quote these words here in this passage?