In the next verse...
In the next verse, the Qur'an describes their state when they are present at the gathering-place of resurrection. It says: " How well they will hear and see on the day they come to Us! …" But, now that they are in this life, these cruel people are in a manifest aberration busy with their transgression.
The verse continues saying: "…But the unjust (even) this day are in manifest straying." In principal, the observation of that court in Hereafter and the effects of the deeds, remove the sleep of negligence from the eyes and the ears so that the blind-hearted ones will become aware and wise. But, what a pity! This awareness will be of no avail to them.
One of the names of Hereafter is 'the Day of Regret', regret for the missed opportunities and for the lost capitals. Death of a man in the state of negligence and faithlessness, is a source of regret. Therefore, this verse addresses the Prophet (p.b.u.h.) and commands him to warn the pagans of Mecca from the Day when the sinners will regret why they had not done some more good deeds. This Day is the Day of Resurrection.
Some commentators say that in that Day only those who deserve punishment will regret. In Sahih-i-Muslim there has been narrated by Abu-Sa'id-i-Khidri that the Prophet of Islam said: "When the people of Heaven will enter Paradise and the people of Hell will enter the Hell Fire, all of them will be called and, thus, their attentions will be attracted. Then, the death will be shown to them and they will be told: 'Do you know death?' They will say: 'This is the death', while they all know it.