The Law Promised Life
"For Moses writes about the righteousness that is based on the law, that the person who does the commandments shall live by them (Ro 10:5). [but] The very commandment that promised life proved to be death to me (Ro 7:10) "For whoever keeps the whole law but fails in one point has become accountable for all of it." (Jas 2:10) "For God [sent] his own Son in the likeness of sinful flesh ... in order that the righteous requirement of the law might be fulfilled in us" (Ro 8:3-4)
Perfect law-keeping is required to merit eternal life. But the law, rather, brings death because we all have failed to keep it, save for Jesus Christ who was "born under the law" and fulfilled its righteous requirements on our behalf. Praise be to God.