What we say is from the overflowing of our hearts. If your speech is full of negative comments about others, then your heart is overflowing with toxic acid. If your speech is tainted with the venom of cynicism and criticism, then your heart is full of poison. If you find your words green with envy and jealousy, even if they are disguised as humor, then you have a crystal clear x-ray of your heart filled with puss. Throughout this day, take frequent mini heart tests, even in the midst of a conversation, as you monitor your speech.
— Edward Hays, The Old Hermit's Almanac