But if anyone causes one of these little ones who believe in me to sin, it would be better for him to have a large millstone hung around his neck and to be drowned in the depths of the sea.
To cause people to sin, is worse than sinning. Because people who causes others to sin are often priests and teachers. When you causes people to do what God hates, you become a child of the devil. The Messiah says It would have been less painful for you to be drowned, than to spend eternity where you will end up in the flames of Hell.