James 3:7-10

For every species of beasts and birds, of reptiles and sea creatures, is tamed and has been tamed by the human race. But no one can tame the human tongue; it is a restless evil [undisciplined, unstable], full of deadly poison. With it we bless our Lord and Father, and with it we curse men, who have been made in the likeness of God. Out of the same mouth come both blessing and cursing. These things, my brothers, should not be this way [for we have a moral obligation to speak in a manner that reflects our fear of God and profound respect for His precepts].