This document discusses the power and danger of the tongue based on passages from the Bible. It notes that while the tongue is small, it can do great harm by spreading lies, gossip, and curses. No person can fully tame their tongue, and with our words we can bless God but also curse people. The tongue should not both bless and curse, just as a spring does not produce both fresh and salt water. We must control our speech and be merciful with our words.