Romans 7:14
We know that the law is spiritual; but I am carnal, sold under sin.
Matthew 12:34-35
You brood of vipers! how can you speak good, when you are evil? For out of the abundance of the heart the mouth speaks.
Romans 7:12
So the law is holy, and the commandment is holy and just and good.
Ephesians 4:29
Let no unwholesome talk come out of your mouths, but only such as is good for building others up according to the need of the moment, that it may impart grace to those who hear.
Colossians 4:6
Let your speech always be full of grace, seasoned with salt, so that you may know how you ought to answer everyone.