Heart and Mouth
“Do you not understand that everything that goes into the mouth passes into the stomach, and is eliminated?
“But the things that proceed out of the mouth come from the heart, and those defile the man. “For out of the heart come evil thoughts, murders, adulteries, fornications, thefts, false witness, slanders. “These are the things which defile the man; but to eat with unwashed hands does not defile the man.” (Mat 15:17-20 NASB)
Christ calls on those who say they follow Christ should receive this warning about the mouth, and examine their heart (emotional) condition. Jesus is saying the status of your Christian walk can be measured by what comes out of your mouth.