The Purpose of a Human Being Is to Serve

One of the ideas i've heard is, the purpose of a human being is to serve. Have you ever heard that before? Like, our purpose here is to serve in some way. The other idea is that this can be refined and sort of shifted to some kind of absolute source. Is there a group of people who are aware that we assign ourselves our roles by figuring out if you respond to that? Do you response to that?