Of course we here on earth (planet number one, the planet of inexperience) can only fabricate vague fantasies of what will happen to man on those other planets. Will he be wiser? Is maturity within man's power? Can he attain it through repetition? Only from the perspective of such a utopia is it possible to use the concepts of pessimism and optimism with full justification: an optimist is someone who thinks that on planet number five the history of mankind will be less bloody. A pessimist is one who thinks otherwise.