What the Bible says about The grace of God in Truth
(From Forerunner Commentary)
With the phrase "the grace of God in truth," he is beginning to say, "What I have taught you is the truth. What you are being tempted by is not truth." He is not saying it directly yet, but he will. God, writing to the Colossians and us through the apostle Paul, is a master of psychology.
John W. Ritenbaugh
The Covenants, Grace, and Law (Part Twenty)