A few years ago I read, in one of Scott Turow's books (can't recall which) the following line:

“Life is simply experience; for reasons not readily discerned, we attempt to go on. [Especially after people hit] forty, when they realized that our place here on earth was leased, not owned."

I think I was past that date when I read it, which may have helped me acknowledge it, but the notion, however expressed, tends to help us focus our energies on what we hope for the world, how we dislike people wasting our time, and the grace we extend to others who have been paying exorbitant rates for their lease.