Shamash posted a translation of the famous poem by Jorge Luis Borges, written as a reflection on what he'd do differently if he could live his life over again. Like Shamash says, it's got some cliches, but it's still inspiring as you think about how you want to live your own life. Good discussion in the comments, too.
I commented on one of her other posts that it's wise to use that sort of "future hindsight" to measure the value of your current days. Future hindsight sounds like a dumb oxymoron, but I love the concept. Trying to imagine how we'll look back on our lives (regrets, highlights, joys, sorrows) in old age reveals much about what we really value now -- it forces a sort of gap analysis between how we're living and how we wish we were living.