II Corinthians 3:6 Who also hath made us able ministers of the new testament; not of the letter, but of the spirit: for the letter killeth, but the spirit giveth life.
I spent years of my life not understanding this verse. The letter kills. I knew the Spirit gave life but how could the Bible, the letter, kill.
The letter speaks of the law. The law’s purpose is to kill us, to make us sick, to make us see our need of a Savior. The 10 commandments were given to bring me to the end of myself. When I get to the end of myself then I can be saved. When I get to the end of myself then I will be where I am ready to trust the Lord Jesus to save me!
II Corinthians 3:7 But if the ministration of death, written and engraven in stones, was glorious, so that the children of Israel could not stedfastly behold the face of Moses for the glory of his countenance; which glory was to be done away:
The law was the ministry of death. It was written and engraven in stones and not in their hearts. It was external and not internal. It was never meant to be because the law is our schoolmaster to take us to Jesus.
The law is also the ministry of condemnation.
II Corinthians 3:9 For if the ministration of condemnation be glory, much more doth the ministration of righteousness exceed in glory.
The law condemns us so that we see the need of the ministry of righteousness. Christ is the end of the law for us. He gives us righteousness.
So the letter, the law, kills but the spirit, the Lord Jesus gives life.