“A life spent defensively, worried, is a life wasted.”
Source: Every Second Counts (2003), p. 21
Context: A life spent defensively, worried, is a life wasted.
You know when I need to die? When I'm done living. When I can't walk, can't eat, can't see, when I'm a crotchety old bastard, mad at the world. Then I can die.
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Lance Armstrong 39
professional cyclist from the USA 1971Related quotes

Being Nicholas, The Wired Interview by Thomas A. Bass http://archives.obs-us.com/obs/english/books/nn/bd1101bn.htm

Preface
1910s, The Doctor's Dilemma (1911)
Variant: A life spent making mistakes is not only more honorable but more useful than a life spent doing nothing.
Context: Attention and activity lead to mistakes as well as to successes; but a life spent in making mistakes is not only more honorable but more useful than a life spent doing nothing.

“Time spent with cats is never wasted.”
Frequently attributed to Freud, but there is no evidence Freud ever said it http://www.freud.org.uk/about/faq/.
Misattributed