Pro 17:19 He loveth transgression that loveth strife: and he that exalteth his gate seeketh destruction.
Pro 17:20 He that hath a froward heart findeth no good: and he that hath a perverse tongue falleth into mischief.
Pro 17:21 He that begetteth a fool doeth it to his sorrow: and the father of a fool hath no joy.
Pro 17:22 A merry heart doeth good like a medicine: but a broken spirit drieth the bones.
Pro 17:23 A wicked man taketh a gift out of the bosom to pervert the ways of judgment.
Science backs up verse 22. People who are happy and content are generally healthier than people who are unhappy, stressed, and anxious. It is bad for the heart, literally.