Let me ask you a question. Do you think that those gamblers, thieves, harlots, and drunkards who are trampling the ten commandments under their feet, they who have never given any respect to God’s Word or to His instructions—do you think they will be swept into the kingdom of heaven, against their will? Do you think those antedeluvians who were so sinful that God could not let them live on the earth would be swept into Paradise and Noah left to wade through the deluge? Do you think that these people, too corrupt for earth, would go there? As I have said before, an unregenerated man in heaven would make a hell of it. An unregenerated man couldn’t stay there. Why, some of you cannot wait an hour here to listen to the Word of God. Before the hour expires you want to go out. Some of you just wish it was over so that you could go and get a drink in some of those saloons. I tell you, from the very depths of my heart, I believe heaven would be a hell to an unregenerated man. “I don’t want to be here,” he would say. My friends, heaven is a prepared place for prepared people, and no one will ever see the kingdom of God without being born of God.

Moody's Anecdotes.