Surah 67. Al-Mulk, Ayah 6

I.e., by presuming to know what will happen in the future - a knowledge which rests with God alone. This connects with the statement in verse {4} that man can never truly unravel the mysteries of cosmic space ("the heavens"), which in its turn implies that he should not presume to foretell terrestrial events from the position and the aspects of the stars. Since only God knows "that which is beyond the reach of a created being's perception" (al-ghayb), any such attempt is a blasphemy (kufr).

We have seen how the fire in the stars can suggest the beauty and order of the external world; and yet, when it meets with resistance and disharmony, it can burn and destroy. So in the moral and spiritual world. What can be a greater sign of evil, disharmony, and rebellion than to reject the Cherisher and Sustainer, on Whom our life depends, and from Whom we receive nothing but goodness? The Punishment, then, is Fire in its fiercest intensity, as typified in the next two verses.