In Stoicism, there's the concept of memento mori, or "remember you will die." The point is to remind yourself that life is finite and that you should make the best use of your time. To some, this seems morbid, but to others, it's a motivator to prioritize your goals, love deeply, not hold pointless grudges, and treat others well (as they too will die).
"You could leave life right now. Let that determine what you do and say and think." -Marcus Aurelius