The Mind and Spiritual Warfare—Our improvement in moral purity depends on right thinking and right acting. “Not that which goeth into the mouth defileth a man; but that which cometh out of the mouth, this defileth a man.” “For out of the heart proceed evil thoughts, murders, adulteries, fornications, thefts, false witness, blasphemies. These are the things which defile a man” (Matthew 15:11, 19, 20). (1MCP 69.1) MC VC