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Every challenge is an opportunity in disguise.

我從十五歲開始致力于學習，三十歲便能自立于社會了，四十歲對各種事理不再迷惑不解，五十歲懂得了自然界的規律，六十歲對聽到的事情能領會貫通，并能辨別是非真偽，七十歲時做事能隨心所欲，但又不會超出禮法的規范。

沉默是上帝的語言；其他一切都是拙劣的翻譯。

The people are the government, administering it by their agents; they are the government, the sovereign power.

The Liskov Substitution Principle is a fundamental concept in object-oriented programming, stating that objects of a superclass should be replaceable with objects of a subclass without affecting the correctness of the program.