Theory And Practice

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 (1938 -), American computer scientist, Professor Emeritus at Stanford University, and winner of the 1974 Turing Award, quoted in: Arturo Gonzalez-Gutierrez (2007) Minimum-length Corridors: Complexity and Approximations. p. 99