Each man who reaches  the World to Come and sees what the other  person has amounted to and knows that they studied  together in the same class, but look how he invested his  life in spiritual matters and what levels he's attained, and  there it's for eternity, not temporary so this is something that should awaken  him at least for his personal interest, not from the side of  true perfection, but rather from personal interest of  gains vs. losses in the life of eternity 