27-66
No, their knowledge has reached (its limit with regard to its penetration) into the hereafter, no, they are in a doubt regarding it, no, they are blind regarding it. (R 5)
Human knowledge cannot penetrate the hereafter, it is out of its jurisdiction. This probably means that human beings cannot verify the knowledge of the hereafter given in Quran and Hadees, it is part of unseen, to be certain of.
27-67
And those who do not believe say, “”What! when we become (part of the) soil and our fathers (too), will we be brought out?
Infidels do not believe in the life after death, they are to be informed that the end might be approaching fast. It is quite possible that the Universe has started to collapse but we have not received the signal so far. The end will come suddenly 6:31. Some scientist too have shown that it will come in 10 of a second.
27-73
And your Fosterer is certainly full of grace for mankind but the majority of them is not grateful.
Allah (SWT) is graceful to mankind but the majority is ungrateful. He knows everything which is also recorded.
27-76
This Quran certainly narrates to the children of Israel, most of those (matters) in which they differ,
There is mention in the Quran about matters in which the Bani Israel differ, it is a guide & mercy for the believers.
27-78
Your Fosterer will certainly decide between them by His judgment, and He is the Mighty, the Knowing,
Allah (SWT) will give the final judgment. Prophet Muhammed (PBH) was on the truth.