Below is a list of the included quotes, feel free to suggest as many quotes as you wish. It's prefered to add quotes in english, but I don't think there's any problems on adding a few quotes from each language as well..
Open your mind to a world of possibilities..
"Imagination is more important than knowledge"
"Gravitation is not responsible for people falling in love"
"The hardest thing in the world to understand is the income tax"
"Reality is merely an illusion, albeit a very persistent one"
"The only real valuable thing is intuition"
"A person starts to live when he can live outside himself"
"I never think of the future. It comes soon enough"
"The eternal mystery of the world is its comprehensibility"
"Anyone who never made a mistake, never tried anything new"
"Great spirits have often encountered violent opposition from weak minds"
"Everything should be made as simple as possible, but not simpler"
"Science is a wonderful thing if one does not have to earn one's living at it"
"The only thing that interferes with my learning is my education"
"The whole of science is nothing more than a refinement of everyday thinking"
"The most incomprehensible thing about the world is that it is comprehensible"
"We can't solve problems by using the same kind of thinking we used when we created them"
"Education is what remains after one has forgotten everything he learned in school"
"The important thing is not to stop questioning. Curiosity has its own reason for existing"
"Not everything that counts can be counted, and not everything that can be counted counts"
"In theory there is no difference between theory and pratice. In pratice there is"
"The greatest ignorance is to reject something you know nothing about."
"It is impossible to defeat an ignorant man in argument."
"Not ignorance, but ignorance of ignorance, is the death of knowledge."
"Minds are like parachutes. They only function when they are open."
"Doubt is not a pleasant condition, but certainty is absurd."
"Of course the code works. It just compiled, didn't it?"
"Wozu braucht man einen Debugger, wenn man test-first programmiert? "
"The best way to predict the future is to invent it."
"If we knew what we were doing, it wouldn't be called research, would it?"
"Speculation or experimentation - which is more likely to give the correct answer?"
"The rules are ways of thinking, not ways to avoid thinking."
"Lubarsky's Law: There's always one more bug. "
"Example isn't another way to teach, it is the only way to teach."
"Knowledge is the only resource on earth that multiplies when shared."
"Always listen to the experts. They'll tell you what can't be done and why. Then do it."
"To the man who only has a hammer in the toolkit, every problem looks like a nail."
"Education is the ability to listen to almost anything without losing your temper or your self-confidence."
"To improve is to change, to be perfect is to change often."
"Don't ask whether you can do something, but how to do it."
"If it doesn't look simple, you probably got it wrong!"
"Walking on water and developing software from a specification are easy if both are frozen."
"Thoughts, like fleas, jump from man to man. But they don't bite everybody."
"Adapt, improvise, overcome."
"I can't understand why people are frightened of new ideas. I'm frightened of the old ones."
"One test is worth a thousand expert opinions. "
"Some people really love to solve hard puzzles. I respect them."
"Creativity is making the complicated simple."
"Press any key to continue, or any other key to quit"
"If debugging is the art of removing bugs, then programming must be the art of inserting them."