19. What then was the purpose of the Law? It was added [later on, after the promise, to disclose and expose to men their guilt] because of transgressions and [to make men more conscious of the sinfulness] of sin; and it was intended to be in effect until the Seed (the Descendant, the Heir) should come, to and concerning Whom the promise had been made. And it [the Law] was arranged and ordained and appointed through the instrumentality of angels [and was given] by the hand (in the person) of a go-between [Moses, an intermediary person between God and man].
20. Now a go-between (intermediary) has to do with and implies more than one party [there can be no mediator with just one person]. Yet God is [only] one Person [and He was the sole party in giving that promise to Abraham. But the Law was a contract between two, God and Israel; its validity was dependent on both].
21. Is the Law then contrary and opposed to the promises of God? Of course not! For if a Law had been given which could confer [spiritual] life, then righteousness and right standing with God would certainly have come by Law.
22. But the Scriptures [picture all mankind as sinners] shut up and imprisoned by sin, so that [the inheritance, blessing] which was promised through faith in Jesus Christ (the Messiah) might be given (released, delivered, and committed) to [all] those who believe [who adhere to and trust in and rely on Him].
23. Now before the faith came, we were perpetually guarded under the Law, kept in custody in preparation for the faith that was destined to be revealed (unveiled, disclosed),
24. So that the Law served [to us Jews] as our trainer [our guardian, our guide to Christ, to lead us] until Christ [came], that we might be justified (declared righteous, put in right standing with God) by and through faith.
25. But now that the faith has come, we are no longer under a trainer (the guardian of our childhood).