Surah 6. Al-An'am, Ayah 149

In other words, the real relationship between God's knowledge of the future (and therefore the ineluctability of what is to happen in the future) on the one side, and man's free will, on the other - two propositions which, on the face of it, seem to contradict one another - is beyond man's comprehension; but since both are postulated by God, both must be true. The very concept of "God" presupposes His omniscience; and the very concept of morality and moral responsibility presupposes free will on man's part. Had God so willed, every human being would have been forced to live righteously; but this would have amounted to depriving man of his free will, and morality of all its meaning.

On the other hand, the argument cuts true and deep, as from God to His creatures. God is Omnipotent, and can do all that we can conceive. But He, in His Plan, has given man some responsibility, and some choice in order to train man's will. If man fails, he is helped in various ways by God's mercy and grace. But man cannot go on sinning, and in a state of sin, expect God to be pleased with him (vi. 147).