I love poetry and quotes, especially those that deal with existence.
Two of my favorites being by Ludvig Wittgenstein and W.H Auden.

First, Ludvig says," I don't know why we are here, but I'm pretty sure that it is not in order to enjoy ourselves."

He was a cheerful bastard, wasn't he?

Second, Auden says," We are here to help others; what the others are here for, I have no idea."