That life is worth living is the most necessary of assumptions and, were it not assumed, the most impossible of conclusions.

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Citation

Santayana, George. The Life of Reason: Introduction and Reason in Common Sense, edited by Marianne S. Wokeck and Martin A. Coleman. Vol. 7, The MIT Press, 2011, bk. 1, ch. 10. Originally published by Charles Scribner's Sons, 1905.