If Duryodhana inflicted these wrongs on the sons of Pandu, it is thy duty, O king of men, to undo them all. Re-instating them in their position, thou wilt, in this world, be cleansed of all thy sins and be, O king of men, an object of worship with even those that have their souls under control. Reflecting on the well-spoken words of the wise according to their consequences, he that engageth in acts never loseth fame.

In plain words: Vidura says that since Duryodhana wronged the Pandavas, it is the king's duty to set things right and give them back their place. Doing this would cleanse the king of his wrongs and earn the respect of the wise. A person who thinks about good advice and its results before acting never loses his good name.