Controlling complexity is the essence of computer programming.
Software Tools (1976), p. 319 (with P. J. Plauger)
The most effective debugging tool is still careful thought, coupled with judiciously placed print statements.Brian Kernighan
Everyone knows that debugging is twice as hard as writing a program in the first place. So if you're as clever as you can be when you write it, how will you ever debug it?Brian Kernighan
Do what you think is interesting, do something that you think is fun and worthwhile, because otherwise you won't do it well anyway.Brian Kernighan