Teach and admonish one another with all wisdom through psalms, hymns, and songs from the Spirit - Colossians 3:16
The tongue has the power of life and death, and those who love it will eat its fruit. - Proverbs 18:21
It is better to remain silent and be, than to talk and not be. It is a fine thing to teach, if the teacher also acts. - St. Ignatius
Be wise in the way you act toward outsiders; make the most of every opportunity. - Colossians 4:5