James 3:6-8

And the tongue is [in a sense] a fire, the very world of injustice and unrighteousness; the tongue is set among our members as that which contaminates the entire body, and sets on fire the course of our life [the cycle of man’s existence], and is itself set on fire by hell (Gehenna). 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.