The plan was for Jesus to come to Earth two thousand years ago with a pocketful of miracles and souls for the people who were then alive. After his return to heaven from Earth he is going to build those mansions, come back before his generation dies out, finally put an end to the world which has been such a rotten disappointment, and deposit most of these souls in hell. No wonder heaven is only 12,000 furlongs wide, long, and high.