Leaders' Book Club discussion

This line from Mediations has stayed with me:
"You could leave life right now. Let that determine what you do, say, and think."
 – Marcus Aurelius, Meditations 2.11

Stoic, yes – but also deeply grounding. I've found that remembering the fragility of life doesn't make me fearful – it sharpens my attention and reminds me to spend my time on what truly matters.

Are there any lines you find yourself returning to?