“It is not the things we do in life that we regret on our death bed. It is the things we do not.”
CMU Graduation speech (2008)
Context: It is not the things we do in life that we regret on our death bed. It is the things we do not. I assure you I've done a lot of really stupid things, and none of them bother me. All the mistakes, and all the dopey things, and all the times I was embarrassed — they don't matter. What matters is that I can kind of look back and say: Pretty much any time I got chance to do something cool I tried to grab for it — and that's where my solace comes from.
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Randy Pausch 83
American professor of computer science, human-computer inte… 1960–2008Related quotes
“One thing I can tell you for sure is this: we only regret what we don't do in life.”
Source: Firefly Lane

The grand old man of American psychiatry on what he has learnt about life (and death) in his still-flourishing career, The Independent http://www.independent.co.uk/news/people/profiles/irvin-d-yalom-interview-the-grand-old-man-of-american-psychiatry-on-what-he-has-learnt-about-life-10134092.html

How to Die, The Atlantic, October 2017 Issue https://www.theatlantic.com/magazine/archive/2017/10/how-to-die/537906/

“Our dignity is not in what we do, but in what we understand. The whole world is doing things.”
Source: Winds of Doctrine: Studies in Contemporary Opinion (1913), p. 199