— Charles M. Schulz American cartoonist 1922 - 2000
Misattributed, 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."
— Dr. Seuss American children's writer and illustrator, co-founder of Beginner Books 1904 - 1991
— Mitch Albom, Have a Little Faith: a True Story
„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.“
— Ward Cunningham American computer programmer who developed the first wiki 1949
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.
— Corrie ten Boom, Clippings from My Notebook