In my experience the work comes from a love of God and fellowman and a desire to serve.
So, there is no self-serving goal such as reaching a "celestial kingdom" involved? Then why all the temple requirements and ceremonies? Love of God and a desire to serve?
Millions have loved God and served man through the years without all the rigamarole of chants and hand signals and proscribed underwear. Of course, the pat answer is that is what proxy baptism is for. Thankfully, the world's Christian population doesn't buy that. It's a shame that so many do literally, buy it.