Can't help but be reminded of a novel I read in university - Faith of the Fallen (Sword of Truth series). It wrote of similar theme (with a more focus on faith/religion), of how one must serve the greater good, humanity and the whim of his fellow men. Going down further, you go into the philosophical territory of individualism vs collectivism, how do you decide and balance your own moral ground, your 'selfish' needs and the needs of your neighbours.