How we spend our time is how we spend our days. How we spend our days is how our life goes. How our life goes determines whether we thought it was worth living.
We often do not figure this out until the end. I didn’t really get it until age 51 — on the day I thought my life was ending. Of course, no amount of me talking about it here will convince your mind that this is true. Only you can discover it.

The whole interview is worth your time - Keith Yamashita interview: Time well spent (Harvest)