Oh people, know that you have committed great sins. If you ask me what proof I have for these words, I say it is because I am the punishment of God. If you had not committed great sins, God would not have sent a punishment like me upon you!

"The History Of The World Conqueror". Book by Ala Ad Din Ata Malik Juvaini, translated by J.A. Boyle, p. 105, 1958.