If you read the Koran, you find the most wonderful truths mixed with superstitions. How will you explain it? That man (Prophet Mohammed) was inspired, no doubt, but the inspiration was as it were, stumbled upon. He was not a trained Yogi, and did not know the reason of what he was doing. Think of the good Mohammed did to the world, and think of the great evil that has been done through his fanaticism! Think of the millions massacred through his teachings, mothers bereft of their children, children made orphans, whole countries destroyed, millions upon millions of people killed!

Complete works of Swami Vivekananda. Vol. I. P. 184