[Pooya/Ali Commentary 99:3] As after the terrible disaster the day of judgement will begin, it will be so a far-reaching convulsion that no earthquake which has taken place before can even be compared to it. It only gives some idea of the world-shaking event. Having no idea of such a tremendous convulsion, consequences of which will be totally different from any convulsion experienced by man, he will not be able to make head or tail of it. He will be in a puzzled agony of total confusion.