Overall meaning : Allah Almighty states: We sent messengers before you, Muhammad, to past nations, but they mocked and disbelieved every single messenger that came to them. Just as We made a way for the previous messengers’ books in the hearts of their unbelieving peoples, so, too, We have made a way for the Qur’an in the hearts of the wicked among your people, such that they hear it, comprehend it and know it is the truth but they still would not believe in it despite the many examples of Allah’s way of destroying the unbelievers that have gone before.
Even if We opened for the unbelievers of Makkah a gateway to heaven and they continued to ascend through it to witness the wonders of Allah’s Kingdom in the heavens, they would still disbelieve and say, ‘Our eyes have truly been shut because of the effect of magic and so we have not seen anything at all! In fact, we must have been bewitched by Muhammad!’