如果你研究计算机的抽象层次，你会发现无论在具体哪个层次，在其下都还有若干个你不清楚的抽象层次，
但是我们必须明白要学会忽略细节。
理解复杂事物的关键在于避免不必要的观察、计算和思考。
The key to understanding complicated things is to know what not to look at and what not to compute and what not to think.
保守通常与年长者挂钩，但犯这个错误的往往是年轻人。缺乏经验使他们畏惧风险，而年轻时恰恰是你最能承受风险的阶段。
Though conservatism is usually associated with the old, it's the young who tend to make this mistake. Inexperience makes them fear risk, but it's when you're young that you can afford the most.
—— Paul Graham《How to Do Great Work》
有意识地培养对本领域杰作的鉴赏力。若不能辨识何为最佳及其卓越所在，便如同在迷雾中前行。
Consciously cultivate your taste in the work done in your field. Until you know which is the best and what makes it so, you don't know what you're aiming for.
—— Paul Graham《How to Do Great Work》
偶尔停下来问问自己：我正在做最想做的事吗？年轻时偶尔回答"不是"还情有可原，但随着年龄增长，这种情况会越来越危险。
Stop occasionally and ask yourself: Am I working on what I most want to work on? When you're young it's ok if the answer is sometimes no, but this gets increasingly dangerous as you get older.
—— Paul Graham《How to Do Great Work》
