Years ago a friend and I went to hear Willie Nelson perform at the state fair. I'll never forget all of us in the audience kicking back, looking up at the stars and listening to Willie sing this song. I can still feel that moment when I hear it.
I think another reason this song moves me is that it speaks to past regrets and loves left unspoken. Sort of a universal thing for us humans I expect...all the ways we wish we had remembered to slow down and speak from the heart.