Test yourself on mankind. It is something that makes the doubter doubt, the believer believe.[Prüfe dich an der Menschheit. Den Zweifelnden macht sie zweifeln, den Glaubenden glauben.]

Source:Dearest Father: Stories and Other Writings (Schocken Books, ed. 1954), Chapter 2. Reflections on Sin, Suffering, Hope, and the True Way, Aphorisms 75, Page 42
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