The problem is, some people are so clever, they can talk themselves into believing things that are not only lies, but completely absurd. The only thing that gives these clever people any kind of stability or foundation in their lives is moral law, and that law descends from God -- there is no other source for it. Morality comes from God. When these clever people decide there is no God, and turn away from moral law, they might as well be tumbling end over end through space. They are forever lost.