# Quotations

**“Nothing is more practical than a good theory.”**

-Vladimir N. Vapnik, The Nature of Statistical Learning Theory

**“We all know the feeling that follows when one investigates a problem, goes through a large amount of algebra, and finally investigates the answer to find that the entire problem is illuminated not by the analysis but by the inspection of the answer.”**

-Tom Cover, Joy Thomas, Elements of Information Theory

**“If you can’t explain it simply, you don’t understand it well enough.”**

– Albert Einstein

**“… for these last (to give precise definitions of the notions used and to employ these to build correct proofs) are no more, in the end, than a “pulling into shape” of intuition.”**

– Jean Dieudonné, Infinitesimal Calculus

**“吾生也有涯，而知也無涯，以有涯隨無涯，殆已。”**

(Life is limited but knowledge to be gained is unlimited. To use the limited to pursue the unlimited was foolish.)

– 莊子(Zhuangzi)，《莊子‧養生主》

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