Innovation is not the goal; solving customer pain points is the true meaning of innovation.

If one only wished to be happy, this could be easily accomplished; but we wish to be happier than other people, and this is always difficult, for we believe others to be happier than they are.

读比听快，做比看快。

The human body is the best picture of the human soul.

里氏替换原则是面向对象编程中的一个基本概念，确保派生类可以替代其基类使用，而不会改变程序的正确性。