The worst part of today, is that by tomorrow, it will have become yesterday. The past is the only part of your life you can ever be sure of, so don’t worry about tomorrow; worry about yesterday - tomorrow’s yesterday.

You can derive the following “corollary”, if you will: never live every moment like it’s your last; that’s naive. Instead, live every moment knowing that you’re going to have to remember it, clear as day, for better or worse, for the rest of your life.

This is not realism, cynicism, or overly-analytical; it just is.