Let us go to Romans 2:17, where I want you to think of yourself in this context.
We know that Paul was speaking to those Jews who were not yet converted. At least, I hope that they were not yet converted and that they have opportunity yet to repent of those things. But this makes it very plain that God's name is hallowed - or profaned - by our conduct. The third commandment is kept - or broken - by the same. This is the commandment that tests the quality of our witness.