“To worry about tomorrow is to detract from your work today. Time you spend thinking about tomorrow is time you're not spending thinking about what to do today.”
A Conversation with Ward Cunningham (2003), To Plan or Not To Plan
Context: To worry about tomorrow is to detract from your work today. Time you spend thinking about tomorrow is time you're not spending thinking about what to do today. The place you leave in the code because you think you'll need it tomorrow, is actually a waste of time today — and a liability tomorrow. It does more harm than good.
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Ward Cunningham 69
American computer programmer who developed the first wiki 1949Related quotes
“Remember, today is the tomorrow you worried about yesterday.”
Source: How to Stop Worrying and Start Living (1948), p. 237. Part 8 : How I Conquered Worry,

“Do not worry about tomorrow, for tomorrow will worry about itself..”
Source: Have a Little Faith: a True Story


“I'm having too much fun today to worry about tomorrow.”

“Don't worry about the world coming to an end today …… It's already tomorrow in Australia.”
Came from an online quiz falsely attributed to Schulz http://www.snopes.com/glurge/schulz.asp. However, in the 13 June 1980 Peanuts strip http://www.gocomics.com/peanuts/1980/06/13, Marcie does say "I promise there'll be a tomorrow, sir. In fact, it's already tomorrow in Australia."
Misattributed

A Conversation with Ward Cunningham (2003), The Simplest Thing that Could Possibly Work

“Love isn't about what we did yesterday; it's about what we do today and tomorrow and the day after”
Source: The Next American Revolution: Sustainable Activism for the Twenty-First Century