Top 60 Donald Knuth Quotes (2025 Update)

1. “Premature optimization is the root of all evil.”

— Donald Knuth

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2. “Programming is the art of telling another human being what one wants the computer to do.”

— Donald Knuth

Featured in: Programming Quotes

3. “Computer programming is an art, because it applies accumulated knowledge to the world, because it requires skill and ingenuity, and especially because it produces objects of beauty. A programmer who subconsciously views himself as an artist will enjoy what he does and will do it better.”

— Donald Knuth

Featured in: Programming Quotes, IT Quotes

4. “Everyday life is like programming, I guess. If you love something you can put beauty into it.”

— Donald Knuth

Featured in: Programming Quotes

5. “An algorithm must be seen to be believed.”

— Donald Knuth

Featured in: IT Quotes

6. “Computers are good at following instructions, but not at reading your mind.”

— Donald Knuth

7. “Science is what we understand well enough to explain to a computer. Art is everything else we do.”

— Donald Knuth

8. “If you optimize everything, you will always be unhappy.”

— Donald Knuth

9. “Always remember, however, that there’s usually a simpler and better way to do something than the first way that pops into your head.”

— Donald Knuth

10. “A mathematical formula should never be “owned” by anybody! Mathematics belong to God.”

— Donald Knuth

11. “The best theory is inspired by practice.”

— Donald Knuth

12. “Beware of bugs in the above code; I have only proved it correct, not tried it.”

— Donald Knuth

13. “We should forget about small efficiencies, say about 97% of the time: premature optimization is the root of all evil. Yet we should not pass up our opportunities in that critical 3%.”

— Donald Knuth

14. “Let us change our traditional attitude to the construction of programs. Instead of imagining that our main task is to instruct a computer what to do, let us concentrate rather on explaining to human beings what we want a computer to do.”

— Donald Knuth

15. “It is much more rewarding to do more with less.”

— Donald Knuth

16. “I’ve never been a good estimator of how long things are going to take.”

— Donald Knuth

17. “Programs are meant to be read by humans and only incidentally for computers to execute.”

— Donald Knuth

18. “People think that computer science is the art of geniuses but the actual reality is the opposite, just many people doing things that build on each other, like a wall of mini stones.”

— Donald Knuth

19. “We should continually be striving to transform every art into a science: in the process, we advance the art.”

— Donald Knuth

20. “I’m obsessively detail-oriented.”

— Donald Knuth

21. “If you find that you’re spending almost all your time on theory, start turning some attention to practical things; it will improve your theories. If you find that you’re spending almost all your time on practice, start turning some attention to theoretical things; it will improve your practice.”

— Donald Knuth

22. “The hardest thing is to go to sleep at night, when there are so many urgent things needing to be done. A huge gap exists between what we know is possible with today’s machines and what we have so far been able to finish.”

— Donald Knuth

23. “I can’t go to a restaurant and order food because I keep looking at the fonts on the menu.”

— Donald Knuth

24. “I define UNIX as 30 definitions of regular expressions living under one roof.”

— Donald Knuth

25. “For his major contributions to the analysis of algorithms and the design of programming languages, and in particular for his contributions to the “art of computer programming” through his well-known books in a continuous series by this title.”

— Donald Knuth

26. “The important thing, once you have enough to eat and a nice house, is what you can do for others, what you can contribute to the enterprise as a whole.”

— Donald Knuth

27. “In fact what I would like to see is thousands of computer scientists let loose to do whatever they want. That’s what really advances the field.”

— Donald Knuth

28. “Random numbers should not be generated with a method chosen at random.”

— Donald Knuth

29. “The enjoyment of one’s tools is an essential ingredient of successful work.”

— Donald Knuth

30. “Meta-design is much more difficult than design; it’s easier to draw something than to explain how to draw it.”

— Donald Knuth

31. “The designer of a new kind of system must participate fully in the implementation.”

— Donald Knuth

32. “Programming is legitimate and necessary academic endeavour.”

— Donald Knuth

33. “The sun comes up just about as often as it goes down, in the long run, but this doesn’t make its motion random.”

— Donald Knuth

34. “The process of preparing programs for a digital computer is especially attractive, not only because it can economically and scientifically rewarding, but also because it can be an aesthetic experience much like composing poetry or music.”

— Donald Knuth

35. “My general working style is to write everything first with pencil and paper, sitting beside a big wastebasket. Then I use Emacs to enter the text into my machine.”

— Donald Knuth

36. “The most important thing in the programming language is the name. A language will not succeed without a good name. I have recently invented a very good name and now I am looking for a suitable language.”

— Donald Knuth

37. “I remember that mathematicians were telling me in the 1960s that they would recognize computer science as a mature discipline when it had 1,000 deep algorithms. I think we’ve probably reached 500.”

— Donald Knuth

38. “The whole thing that makes a mathematician’s life worthwhile is that he gets the grudging admiration of three or four colleagues.”

— Donald Knuth

39. “I can’t be as confident about computer science as I can about biology. Biology easily has 500 years of exciting problems to work on. It’s at that level.”

— Donald Knuth

40. “These machines have no common sense; they have not yet learned to “think,” and they do exactly as they are told, no more and no less. This fact is the hardest concept to grasp when one first tries to use a computer.”

— Donald Knuth

41. “It would be nice if we could design a virtual reality in Hyperbolic Space, and meet each other there.”

— Donald Knuth

42. “I decry the current tendency to seek patents on algorithms. There are better ways to earn a living than to prevent other people from making use of one’s contributions to computer science.”

— Donald Knuth

43. “There’s ways to amuse yourself while doing things and thats how I look at efficency.”

— Donald Knuth

44. “By understanding a machine-oriented language, the programmer will tend to use a much more efficient method; it is much closer to reality.”

— Donald Knuth

45. “Trees sprout up just about everywhere in computer science...”

— Donald Knuth

46. “A list is only as strong as its weakest link.”

— Donald Knuth

47. “Email is a wonderful thing for people whose role in life is to be on top of things. But not for me; my role is to be on the bottom of things. What I do takes long hours of studying and uninterruptible concentration.”

— Donald Knuth

48. “People who are more than casually interested in computers should have at least some idea of what the underlying hardware is like. Otherwise the programs they write will be pretty weird.”

— Donald Knuth

49. “In fact, my main conclusion after spending ten years of my life working on the T E X project is that software is hard. It’s harder than anything else I’ve ever had to do.”

— Donald Knuth

50. “I have a hunch that the unknown sequences of DNA will decode into copyright notices and patent protections.”

— Donald Knuth