Why Do We Serve?

With Christmas rapidly approaching, people turn their thoughts toward service to celebrate the birth of Christ.  In Matthew 22:36-40 and John 13:34-35, we are told to love our neighbors as ourselves, that true disciples of Christ love one another.  Because, "If ye love them which lover you, what reward have ye? do not even the publicans the same? (Matt. 5:46–47.)
We should, then, be serving out of love for others.  But is that always why we serve?  Elder Dallin H. Oaks lays down 6 reasons people serve, in his November 1984 Conference Address Why Do We Serve? They are, first, for riches and honor, second, a personal desire to obtain good companionship, third, a fear of punishment,  fourth, a sense of duty, fifth, hope for an eternal reward, and sixth, out of love.  
The first three are basically self interested.  The fourth is an unquestioning obedience to a law, duty or tradition (deontology). The fifth is a look forward at eternal consequences (utilitarianism).  The sixth, which Elder Oaks calls "the highest reason of all" is because of a Christ-like love of others (virtue). So as we serve this season, it may be beneficial to question our motives, and try to develop the pure love of Christ in our lives.