I've learned that life is short, and sometimes you find out its even shorter than you once thought, so regardless of what's happening in your life, in the lives of those around you and in the world in general that you need to stop procrastinating, stop saying "one day I'll... " , and get out there and live, do that thing you wanted to do forever, go to that place you've always dreamed of, and learn that thing you've always wanted to learn.
You may think you have all the time in the world, but the world may have other ideas.