Why do we do anything if nothing lasts forever? Every action we make is but a

Read another response by Stephen Maitzen
Read another response about Value
Why do we do anything if nothing lasts forever? Every action we make is but a blip on the finite timeline of the universe, ending with the heat death. All our actions fade into insignificance as they become the past. Similarly, on a smaller scale, why do we do things if life is finite too? What difference would it make to the individual who is unable to witness the effect of his actions?