"Failure to learn is the only true failure"

Tom Poppendieck

"Only a goalie can appreciate what a goalie goes through."

Jacques Plante

"Ever tried?
Ever failed?
No matter.
Try Again.
Fail again.
Fail better"

Samuel Beckett

"It is better to be roughly right than precisely wrong"

John Maynard Keynes

"It is a capital mistake to theorize before one has data"

Sherlock Holmes, Scandal in Bohemia

"If you have a choice of two things and can't decide, take both"

Gregory Corso

"The indespensable first step to getting what you want is this: Decide what you want"

Ben Stein

"To err is human"
(latin: "errare humanum est")

"If you tell people where to go, but not how to get there, you'll be amazed at the results"

General George S. Patton

"There's no sense in being precise when you don't even know what you're talking about"

John von Neumann

"Prediction is very difficult, especially about the future"

Niels Bohr

"To achieve great things, two things are needed: a plan and not quite enough time"

Leonard Bernstein

"A good plan violently executed now is better than a perfect plan executed next week"

General George S. Patton

"No plan survives contact with the enemy"

Field Marshal Helmuth Graf von Moltke

"Planning is everything. Plans are nothing"

Field Marshal Helmuth Graf von Moltke