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"From this time onward, the danger of mankind perishing by human action will always be with us--it will never vanish again. It will have to be met constantly and surmounted afresh, and it is under this pressure that man can rise to his highest potentialities. The moment he relaxes in the illusion of final success, the extreme menace will once more be real, and he will finally lose his mere existence, after all." -- Karl Jaspers, "The Future of Mankind", p. 182.