From Thoughts Without a Thinker: Psychotherapy from a Buddhist Perspective:
“‘You see this goblet?’ asks Achaan Chaa, the Thai meditation master. ‘For me this glass is already broken. I enjoy it; I drink out of it. It holds my water admirably, sometimes even reflecting the sun in beautiful patterns. If I should tap it, it has a lovely ring to it. But when I put this glass on the shelf and the wind knocks it over or my elbow brushes it off the table and it falls to the ground and shatters, I say, ‘Of course.’ When I understand that the glass is already broken, every moment with it is precious.’”
Also, from The Wise Heart:
“One day Ajahn Chah held up a beautiful Chinese tea cup, ‘To me this cup is already broken. Because I know its fate, I can enjoy it fully here and now. And when it’s gone, it’s gone.’ When we understand the truth of uncertainty and relax, we become free.”
And, from Marcus Aurelius, Meditations:
“Think of yourself as dead. You have lived your life. Now take what’s left and live it properly.”