Further along,
we'll know all about it,
further along we'll
understand why,
Cheer up, my brother,
live in the sunshine,
You'll understand it
all bye and bye!"
------------------------

Dave, I'm not sure we'll ever understand-or know the mysteries. I came across this verse today, and it seemed to fit your query. It was on a web tutorial accompanied by a great mandolin piece. I've been playing it for an hour. So I got something out of it.
No answers to life's imponderables - but an awful pretty tune. Wish I knew the name.