He thought that he would not return to God, nor would he be held accountable. It is this suspicion that plunged him into a chasm.
Or they thought that they would not return to the state they were in from the bliss of this world.
Contemplating in these noble verses, we find that they give a picture of absolute justice. Since, the logic of justice is that everyone is accountable. However, whatever the person is righteous, his life is not free of something to be held accountable. But the labor of man determines the way of judgement whether easy or difficult. Among the people whose account is merely a presentation of their deeds, their identification and comparing them with the blessings of Allah (swt) upon him.
“A’isha (May Allah be pleased with her) narrated that the Prophet (saws) said:
(Whoever is interrogated during the reckoning, then he will be punished.)
A’ishah then said, “But didn’t Allah say: (He will be judged with an easy account ). The Prophet replied:
(That is not during to the Reckoning, rather it is referring to the presentation)
Fear, then, is not from the reckoning, but from discussing the reckoning. As for presenting the deeds, it is a matter of gratitude.
 Sahih Bukhari, Book of Softening of hearts, Hadith No. 6171