“Idle wishing for circumstances different from what you had was a waste of time.”
Source: The Heritage Universe, Resurgence (2002), Chapter 20, “Tally on Down” (p. 245)
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Charles Sheffield 41
British scientist, American science fiction writer 1935–2002Related quotes

“A book lying idle on a shelf is wasted ammunition.”
Source: The Books in My Life

“Thinking is but an idle waste of thought,
And nought is everything and everything is nought.”
Rejected Addresses. Cui Bono?, reported in Bartlett's Familiar Quotations, 10th ed. (1919).

Heimsljós (World Light) (1940), Book Four: The Beauty of the Heavens

“The time you enjoy wasting is not wasted time.”
From Marthe Troly-Curtin's Phrynette Married (1912). Misattributed to Bertrand Russell due to an ambiguous entry in Laurence J. Peter's Peter’s Quotations: Ideas for Our Time (1977) http://quoteinvestigator.com/2010/06/11/time-you-enjoy/
Misattributed

“If you love life, don't waste time, for time is what life is made up of.”
Source: Striking Thoughts (2000), p. 10; Here Lee paraphrases a much older English proverb: If you care for life, don't waste your time; for time is what life is made of. (as quoted in Bordighera and the Western Riviera (1883) by Frederick Fitzroy Hamilton, p. 189).
Context: Time means a lot to me because, you see, I, too, am also a learner and am often lost in the joy of forever developing and simplifying. If you love life, don't waste time, for time is what life is made up of.