Across the world, billions of worshippers this weekend will be going to mosques, temples, churches and other places of worship hearing messages declaring that the choices they make in this life can affect their eternal destiny. How each of them, and secular individuals, face the great existential question of the meaning of life in the face of mortality can make a major difference in areas from mental health to preventing terrorism and promoting more generous, compassionate societies less likely to experience civil strife, new research shows.