The gist was that his grandfather had pushed him very, very hard to study and work very, very hard from a very early age. And he was finally able to tell his grandfather that he could no longer tell him what to do/order him to work hard - he had done it all - he had done everything that the grandfather had pushed him to do. It is a sense of closure, more than anything but still very significant. My friend had ulcers in high school, if that is any indication of how hard he studied.