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- The sword of Mahomet and the Coran are the most fatal enemies of civilization, liberty, and truth which the world has yet known.
- Life of Mahomet, Vol. IV (1861), p. 322
- The tragedy of Karbala decided not only the fate of the caliphate, but of the Mohammedan kingdoms long after the Caliphate had waned and disappeared.
- Annals of the Early Caliphate, pages: 441–442.