Wherefore? - And where lies their mistake? Being ignorant of God's righteousness - of his method of saving sinners by faith in Christ, they went about to establish their own righteousness - their own method of obtaining everlasting salvation. They attend not to the Abrahamic covenant, which stands on the extensive principles of grace and faith; but they turn all their regards to the law of Moses. They imagine that their obedience to that law gives them a right to the blessings of the Messiah's kingdom. But, finding that the Gospel sets our special interest in God and the privileges of his Church on a different footing, they are offended, and refuse to come into it.
While we are to be in harmony with God's law, we are not saved by the works of the law, yet we cannot be saved without obedience. The law is the standard by which character is measured. But we cannot possibly keep the commandments of God without the regenerating grace of Christ. Jesus alone can cleanse us from all sin. He does not save us by law, neither will He save us in disobedience to law. FW 95.3
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