Let no corrupting talk come out of your mouths, but only such as is good for building up, as fits the occasion, that it may give grace to those who hear. Ephesians 4:29
Wow, what a convicting verse for me and one I need to repeat to myself over and over! I have chosen this verse for that particular reason.
(Beth Moore and Living Proof Ministries is doing a Scripture memory verse challenge, and you can read about it here.)