Translation:

8. "Has he invented a falsehood against Allah or has a spirit (seized) him?" Nay it is those who believe not in the Hereafter that are in (real) Penalty and in farthest Error.

Notes (Tafseer)

3795. The answer is: the Future Life is the truest of all Truths; so far is the man who teaches it from being demented, that it is those who deny it, that lack knowledge and are in real jeopardy for their souls; for they persecute Truth and must not only suffer defeat, but go farther and farther from Realities and thus suffer the worst hallucination about the next world.