Reb Zusha was laying on his deathbed surrounded by his disciples. He was crying and no one could comfort him. One student asked his Rebbe, “Why do you cry? You were almost as wise as Moses and as kind as Abraham.” Reb Zusha answered, “When I pass from this world and appear before the Heavenly Tribunal, they won’t ask me, ‘Zusha, why weren’t you as wise as Moses or as kind as Abraham,’ rather, they will ask me, ‘Zusha, why weren’t you Zusha?’ Why didn’t I fulfill my potential, why didn’t I follow the path that could have been mine.
There are a lot of good thoughts in the other HackerNews comments too. Worth checking out.