Live.

You miss 100% of the shots that you don't take.
Wayne Gretzky

I've always thought that this was very clever, and so true! I can look back on my life and remember multiple times when I had the opportunity to do something, but passed it up. I may never get some of those opportunities ever again in my life only because I just didn't take the shot. It makes you really take a step back and analyze your life. Are you being productive? Taking every opportunity that comes by? Meeting all the people that you can? Exploring the world? Learning new things? You are given opportunities to do things pretty much every single day of your life. Are you taking advantage of that? Do whatever you need and want to do so that when you're old, you can say that you lived a great life full of adventure, knowledge, and happiness. Don't waste your time sitting around thinking that something will happen and you will experience everything. It doesn't work that way. Live your life.