“We know that the law is good when used correctly” (1 Timothy 1:8 NLT)

Paul taught Timothy the importance of guarding the gospel against those who would misuse the law, claiming its necessity for salvation. Human effort at law-keeping does not save, only believing the gospel saves. Those that teach law-keeping as a means of salvation are not using the law “correctly.” Yet, the law is not useless when used rightly. In fact, there are at least three right uses of the Law: 
The Law is to… (3 “R”s – Gal. 3:19-26) 
1. Restrain our sinful behavior (Like a guard rail).
2. Reflect our guilt (Like a mirror).
3. Reveal God’s righteous way (Like a teacher).
The law is useful when “used correctly,” but only faith in Christ saves.