Much of Christianity has made Sunday morning into an extra special ritual called "the worship." I've heard it said that it's impossible to control your language—by those who control it just fine "at church" during "the worship."  Yet if a person can control his mouth at church for the "worship hour," he can certainly control it the other 167 hours of the week. It's simply a choice not to.

God's not interested in someone that acts differently for an hour per week. Anyone can do that. Instead, he wants you "to present your bodies a living and holy sacrifice, acceptable to God, which is your rational service." (Romans 12:1)

He died for us so that we might live for Him. A tiny fraction of that is embodied in the statement, "For, "Whoever would love life and see good days must keep his tongue from evil and his lips from deceitful speech." (1 Peter 3:10) Let's keep every hour clean and above reproach!