Proverbs 17:20: He that hath a froward heart findeth no good: and he that hath a perverse tongue falleth into mischief.
Meditation: God knows our hearts. Our words and actions come from our hearts. A person who has a wicked heart will not prosper before God or man.
Prayer: God, forgive me for a wicked heart. I can deceive others but I can never deceive you. You warn me that life will be hard and in vain if my heart is not right with you.