Who can tell what he is on Earth to do? When I bought Herndon’s Lincoln, a famous book, I learned (reading the introduction ) that although William Herndon did all the research, he could not have actually written the book had it not been for young Jesse William Weik, whose name is far less remembered today even than Herndon’s.
I don’t know anything about Weik’s life, but although Weik lived to 1930, it may be that he never did anything more important than to help aging Bill Herndon get this book together, decades before.
What was true for him is true for us. We don’t necessarily know what we are here to do. Maybe the work of someone you have helped will become so important to the world that your help will be seen as the most important thing you did in your life. It’s a funny thought, for if true, probably you will never know it.