The Muslim invaders, no doubt, came to India singing a hymn of hate against the Hindus. But, they did not merely sing their hymn of hate and go back burning a few temples on the way. That would have been a blessing. They were not content with so negative a result. They did a positive act, namely, to plant the seed of Islam. The growth of this plant is remarkable. It is not a summer sapling. It is as great and as strong as an oak. Its growth is the thickest in Northern India. The successive invasions have deposited their ‘silt' more there than anywhere else, and have served as watering exercises of devoted gardeners. Its growth is so thick in Northern India that the remnants of Hindu and Buddhist culture are just shrubs. Even the Sikh axe could not fell this oak.