“Remember; no matter how desperate the situation seems, time spent
thinking clearly is never time wasted.”
Source: The Zombie Survival Guide
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Max Brooks 41
American author 1972Related quotes

“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

“Time spent arguing with the faithful is, oddly enough, almost never wasted.”
Source: 2000s, 2001, Letters to a Young Contrarian (2001)

“All time is wasted that is not spent in seeking God.”
This adage is attributed to the ancient sage Sukdeva, as quoted in Promise of Immortality: The True Teaching of the Bible and the Bhagavad Gita (2001) by J. Donald Walters. p. 242
Disputed

“I can't tell you how much time is spent worrying about decisions that don't matter.”
A Conversation with Ward Cunningham (2003), Collective Ownership of Code and Text
Context: I can't tell you how much time is spent worrying about decisions that don't matter. To just be able to make a decision and see what happens is tremendously empowering, but that means you have to set up the situation such that when something does go wrong, you can fix it.