We do not understand all of the evil that is in our hearts until we hear the words that come from it, whether inwardly with thought, or outwardly with words.
King David of the Bible asked: "How can I know all the sin lurking in my heart?" Then he said to the LORD: "Don't let them control me!"
The key to overcoming the evil in our hearts is meditation upon God's Word; to think before we speak, and even pray about every word we want to speak that might or might not cause trouble. This will help us to not speak so quickly.
Some things just don't need to said. Then there are some that must be said no matter what it results in. We need WISDOM from God either way.
"Our words have the power of life and death," says the LORD.
