The Italian original is from Francesco de Sanctis, Storia della letteratura italiana, 1871/1890, p. 255: "L'amore eroico è proprio delle nature superiori, dette insane, non perché non sanno, ma perché soprasanno..."
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Quote text and notes from Wikiquote: Giordano Bruno (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.