I think that those who serve most potently, work on levels of consciousness that have to do with radiating love — maybe God's love... It is important that you have a brain and use it, but that is secondary. The basic premise is that you allow something to come through you. Then you use your intelligence to give your heart's work discipline and logic. But the transformative energy, that which can change events, that heals, that helps, that serves, comes from somewhere deep inside.
Everything is here for the same reason, for manifestation and celebration. But the humans articulate this. The others cannot articulate it reflectively. They can be a manifestation, but they cannot reflect on that. Humans can, therefore our role is to be spokespersons for the universe and to appreciate the universe as the context in which the Divine and human meet.