"I have seen great beauty of spirit in some who were great sufferers. I have seen men, for the most part, grow better not worse with advancing years, and I have seen the last illness produce treasures of fortitude and meekness from most unpromising subjects."

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We should ask, critically and with appeal to the numbers, whether the best site for a growing advancing industrial society is Earth, the Moon, Mars, some other planet, or somewhere else entirely. Surprisingly, the answer will be inescapable - the best site is "somewhere else entirely.

— Gerard K. O'Neill