The truth is not always what we want to hear.

The purpose of abstraction is not to be vague, but to create a new semantic level in which one can be absolutely precise.

出自《抱朴子·外篇·广譬》。登山的时候，不因为山路艰险便停止，就一定能够到达山顶。积善也不会因为穷困而埋怨，便能够使自己获得长久的美名。

有时我认为在计算领域中唯一通用的是获取-执行周期。