Remember that even if you were to live for three thousand years, or thirty thousand, you could not lose any other life than the one you have, and there will be no other life after it. So the longest and the shortest lives are the same. The present moment is shared by all living creatures, but the time that is past is gone forever. No one can lose the past or the future, for if they don't belong to you, how can they be taken from you?
Marcus AureliusKeep in mind how fast things pass by and are gone - those that are now, and those to come. Existence flows past us like a river; the "what" is in constant flux, the "why" has a thousand variations. Nothing is stable, not even what's right here. The infinity of past and future gapes before us - a chasm whose depths we cannot see.
Marcus Aurelius