I Thessalonians 5

9 For God has not appointed us to wrath, but to obtain salvation by Our Lord Jesus Christ.

Because God has not equipped us to vengeance or punishment as the consequence of anger, but to come into possession of deliverance from the power and penalty of sin by Our Lord Jesus Christ.

In other words, just because you're saved doesn't mean you can't or won't get mad. But because you are saved don't speak or act in a moment of anger, remember to call on Him who is able.

My two cents worth: For me just saying His name is enough to make me pause, it also keeps other thoughtless hurtful words from leaving my mouth.

Remember: The power of the tongue.