"It means absolutely nothing to profess Christ if your life doesn't back it up. That's why Peter said that if you can't add virtue to your faith, you're not going to know if you're actually redeemed (see 2 Pet. 1:5-11?). That's what James meant when he said faith minus works equals zero (see James 2:17). The kind of "faith" that makes a verbal profession while the heart continues to pursue sin is no true faith at all. I think the epitome of taking the Lord's name in vain is not using His name as an expletive on the streets, but claiming Christ when He isn't yours."