This is from a spiritual viewpoint too weird to put a name to, just some sort of "I don't know what happens, I just know about me, right now" agno-whatsicism.

You ever notice how much passion we put into life when we know there's an end? How late we stay up at festivals, and how we join every damned jam session we can? How we grab that chance for a 'break' when it comes, because the song has to end? How much we teach or learn when the lesson has a finite length? How honest we are with one another, how kind, and how many times and ways we say 'I love you' when one of us is leaving?

Those of us left behind are bereft. We may be lonely as hell and want just one more minute, one more chance. It's not going to happen. I think those feelings eventually pass, or should. Aside from specific lessons we learn from knowing someone, there is one really big general one: LIVE life.