In Jesus’ day, the Jews were very concerned about keeping kosher laws (eating only clean food, washing hands ceremonially before meals, etc). What dangers does Jesus reveal about an over-emphasis on diet? What would help you to remember that “what comes out of your mouth” is of greater importance than “what goes in”? How would you respond to someone who read this passage and said, “See, even Jesus said it doesn’t matter what you eat”?
Paul makes a statement in 1 Corinthians 10:23, “You say, “I am allowed to do anything” but not everything is good for you.” How does this apply to your diet and “what goes into your mouth.”
Tongue on Fire 