Isaiah 40:8, Exodus 15:22 - 25, Bitterness is a root, it grows slowly and shows up where it wasn't planted. A controlled life is a successful life, A uncontrolled life is a unsuccessful life. Happiness does good like a medicine. How do you keep from being bitter? Its not about understanding, its about obedience. Moses put a tree in the water at Mariah to take away the bitterness. Why a tree? Because God was thinking of another tree that was going to take away the bitterness in the world to those would believe in Him.