1 Peter 3:15
but in your hearts be consecrated to Christ as Lord, and always be ready to make your defense to anyone who asks a reason for the hope you have. But you must do it in gentleness and reverence,
Matthew 12:34
You brood of vipers! How can you, wicked as you are, say anything that is good? For the mouth talks about the things that fill the heart.
Titus 1:10-11
For there are many insubordinate people, mere talkers with nothing to say, but deceivers of their own minds, especially those of the circumcision party,
James 3:6-8
And the tongue is a fire, and takes its place among the parts of our bodies as a world of evil; it soils the whole body and sets on fire the circle of man's nature, and itself is set on fire by hell.
2 Peter 2:18
For by uttering arrogant nonsense, through base desires of the lower nature, they entice into immorality men who are just escaping from those who live in error,