I am accused, at times, of over-using 2 Corinthians, chapter three, in my writing and preaching. I stand guilty as charged. It's not that its truths are not taught throughout the New Testament (and promised in the Old Testament), but that this chapter captures a concise presentation of what I call "the New Covenant Dynamic."
Flowing from the 'ministration' of the gospel through the means of faithful witnesses (vv 1-3), the sovereign and miraculous work of regeneration is effected by the Holy Spirit, writing the letter (law) of Christ upon the hearts of the elect (v3). From that point, heart-fellowship with Christ becomes the dominant factor in a life turned from idols to serve the living God (1 Thess 1:9, repentance proper).
 
From an article by Pastor Ed Ross:
http://www.springwoodchapel.com/files/T&D02.10_TenCommandments.pdf