Translation:

82. Do they not consider the Qur'an (with care)? Had it been from other than Allah they would surely have found therein much discrepancy.

Notes (Tafseer)

601. The unity of the Qur-an is admittedly greater than that of any other sacred book. And yet how can we account for it except through the unity of Allah's purpose and design? From a mere human point of view, we should have expected much discrepancy, because (1) the Messenger who promulgated it was not a learned man or philosopher, (2) it was promulgated at various times and in various circumstances, and (3) it is addressed to all grades of mankind. Yet, when properly understood, its various pieces fit together well even when arranged without any regard to chronological order. There was just the One Inspirer and the One Inspired.