如果你发现你几乎把所有的时间都花在了理论上，那就开始把一些注意力转向实际的东西；这会提高你的理论水平。如果你发现你几乎把所有的时间都花在了实践上，那就开始把一些注意力转向理论上的东西；这将改善你的实践。
—— 高德纳
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
