Quote by Donald Knuth
"I have discovered that the good things and the bad things are of approximately equal quantity; that almost every advantage has an almost equal disadvantage attached to it."
More from Donald Knuth
"The real problem is that programmers have spent far too much time worrying about efficiency in the wrong places and at the wrong times; premature optimization is the root of all evil."
"Science is what we understand well enough to explain to a computer. Art is everything else we do."
"Programming is the art of telling another human what one wants the computer to do."
"The most important principle for the good algorithm designer is to refuse to be content."