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Human nature has nevertheless been changed by the ever new appearance of these teachers of the purpose of existence: It now has one additional need—the need for the ever new appearance of such teachers and teachings of a “purpose.” Gradually, man has become a fantastic animal that has to fulfill one more condition of existence than any other animal: man has to believe, to know, from time to time why he exists; his race cannot flourish without a periodic trust in life—without faith in reason in life.
