Dr. Peter Liebert has studied about medical effect of laughing for a long time in U.S.A. He said that killer cells to attack tumor cells generated profusely in the blood which was drawn from those who laughed. In this manner, laughing affects not only physical health but also mental health. Some may ask how they can laugh when they have nothing to laugh at. Yet if they speak positively and laugh joyfully, relying on God the Almighty, their problems will soon be solved by God's wonderful wisdom, and their problems will be changed into blessings.
"Who has made His counsel wonderful and His wisdom great" (Isaiah 28:29)