You are reading a tafsir for the group of verses 56:1 to 56:7

In the present world, man observes that he is free to do whatever he likes. So the question of retribution in the Hereafter makes no impact on his mind. But the formation of the ‘other world’ is just as possible as the formation of the present world. When that time comes, the whole system will be reversed. Those who were higher in position will go down and those who were lower in position will be elevated. At that time human beings will be divided into three groups, the forward group (as-sabiqun), the people of the Right (ashab al-yamin) and the people of the Left (ashab ash-shimal).