Galatians 3:18-25

For if the inheritance [of what was promised] is based on [observing] the Law [as these false teachers claim], it is no longer based on a promise; however, God granted it to Abraham [as a gift] by virtue of His promise. Why, then, the Law [what was its purpose]? It was added [after the promise to Abraham, to reveal to people their guilt] because of transgressions [that is, to make people conscious of the sinfulness of sin], and [the Law] was ordained through angels and delivered to Israel by the hand of a mediator [Moses, the mediator between God and Israel, to be in effect] until the Seed would come to whom the promise had been made. Now the mediator or go-between [in a transaction] is not [needed] for just one party; whereas God is only one [and was the only One giving the promise to Abraham, but the Law was a contract between two, God and Israel; its validity depended on both]. Is the Law then contrary to the promises of God? Certainly not! For if a system of law had been given which could impart life, then righteousness (right standing with God) would actually have been based on law. But the Scripture has imprisoned everyone [everything—the entire world] under sin, so that [the inheritance, the blessing of salvation] which was promised through faith in Jesus Christ might be given to those who believe [in Him and acknowledge Him as God’s precious Son]. Now before faith came, we were kept in custody under the Law, [perpetually] imprisoned [in preparation] for the faith that was destined to be revealed, with the result that the Law has become our tutor and our disciplinarian to guide us to Christ, so that we may be justified [that is, declared free of the guilt of sin and its penalty, and placed in right standing with God] by faith. But now that faith has come, we are no longer under [the control and authority of] a tutor and disciplinarian.