The God asks do they not think carefully about The Quran? Had it been from other than The God, they would have found therein much contradictions. – It is A Book that confirms what came before it, The Torah of Moses & The Gospel of Jesus, He sent them all. – Do they not think deeply about the heavens & the earth? – think deeply about their own creation (how no two fingerprints are alike)? – The God mentions “think deeply.” “ponder.” “reflect.” “remember.” – The Proof that The Quran is from The God, is The Quran itself. It along with what is revealed therein are miracles.