"The oceans are the planet's last great living wilderness, man's only remaining frontier on earth, and perhaps his last chance to produce himself a rational species."

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More important than the material issue . . . the opening of a new, high frontier will challenge the best that is in us . . . the new lands waiting to be built in space will give us new freedom to search for better governments, social systems, and ways of life.

— Gerard K. O'Neill