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The marvels of Allah's creation can be realized in a general way by every one who has a disposition to allow such knowledge to penetrate his mind. But if men, out of perversity, kill the very faculties which Allah has given them, how can they then understand? Besides the men who deaden their spiritual sense, there are men who may be likened to the deaf, who lack one faculty but to whom an appeal can be made through other faculties, such as the sense of sight; but if they turn their backs and refuse to be instructed at all, how can the Truth reach them?