The historian Thomas Carlyle considered Muhammad one of the world's greatest heroes, yet even he called the Koran "as toilsome reading as I ever undertook, a wearisome, confused jumble."
史学家托马斯.卡莱尔 认为穆哈默德是世界上最伟大的英雄之一， 可即便是他也认为可兰经， “是我有生以来读得最费劲的读物， 叫人厌烦，而且含糊不清。”