Look up. Don't you see the only star twinkling in the vast open sky? You love it, right? Do it now as much as you can... because tomorrow it'll not be there...
No, don't be down. Just love it. If the sun rose just to set, there'd be nothing called life - and light. Love it now, see it now, embrace it now as it won't last. Comes and goes. Everything will have an end, dear. Everything.
So seize the day, seize the moment. This is all you ever have. What was done was done. What will be will be. Right at this moment, there's just what is. Don't cry for the lonely star when it's gone. Aren't you lucky enough to see it into your eyes before it disappears to the eternal sky? You've had a chance to see it, and now, it becomes a memory.
What are dear memories but footprints of things you love? What would leave footprints if you're not going right now? You don't know what tomorrow brings. You can't save what yesterday has. Seize the moment, 'cuz it's all you have. Once you realize that everything is transitory, you'll be grateful for its presence, and be at peace to let it go...
Live the moment, dear.