„Theory and practice sometimes clash. And when that happens, theory loses. Every single time.“

— Linus Torvalds

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„Maybe by the time they were in their Silver Year, Master Rufus would communicate complicated theories of magic by the lifting of a single bushy eyebrow.“
— Cassandra Clare
„Any physical theory is always provisional, in the sense that it is only a hypothesis: you can never prove it. No matter how many times the results of experiments agree with some theory, you can never be sure that the next time the result will not contradict the theory.“
— Stephen Hawking