We are the most unfair, not towards him whom we do not like, but toward him for whom we feel nothing at all.

Friedrich Nietzsche (1844-1900) German philosopher and poet

Thus Spoke Zarathustra [Also Sprach Zarathustra], Part 2, “Of the Compassionate [Von den Mitleidigen]” (1892) [tr. Hollingdale (1961)]
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