Cheerfulness removes the rust from the mind, lubricates our inward machinery, and enables us to do our work with fewer creaks and groans. If people were universally cheerful, probably there wouldn't be half the quarreling or a tenth part of the wickedness there is. Cheerfulness, too, promotes health and immortality. Cheerful people live longest here on earth, afterward in our hearts.
"A cheerful look brings joy to the heart, and good news gives health to the bones." (Proverbs 15:30 NIV)