"The tongue is a small part of the body, but it makes great boasts. Consider what a great forest is set on fire by a small spark. The tongue also is a fire, a world of evil among the parts of the body. It corrupts the whole person, sets the whole course of his life on fire, and is itself set on fire by hell." (James 3:5-6)
I was looking through some interesting papers at my Mom's house this summer and I found an old index card with some practical questions to ask ourselves about our speech and our conduct. Our speech is one of the main things that reflects our walk with Christ as well as our actions. The questions are centered around the acrostic "think."