﴿ لَعَلِّىٓ أَعْمَلُ صَٰلِحًۭا فِيمَا تَرَكْتُ ۚ كَلَّآ ۚ إِنَّهَا كَلِمَةٌ هُوَ قَآئِلُهَا ۖ وَمِن وَرَآئِهِم بَرْزَخٌ إِلَىٰ يَوْمِ يُبْعَثُونَ ﴾

“so that I might act righteously in whatever I have failed [aforetime]!” Nay, it is indeed but a [meaningless] word that he utters: for behind those [who leave the world] there is a barrier [of death] until the Day when all will be raised from the dead!”

As soon as man dies, he is separated from the present world and reaches a point of no-return. Now, he realises that the life Hereafter, which he had hitherto ignored, was in fact the real target in life. The possessions of the pre-death period were for the purpose of earning credit towards the life Hereafter and not as ends in themselves. So, after death, he will immediately want to be sent back to this world. But this will not be possible, because in accordance with the creation plan of God, every man is given only one chance. In the present world man relies on his friends and relatives, but on Judgement Day he will be all alone. There, only his good deeds will be of avail. Nothing else will save him.