The Liskov Substitution Principle is a fundamental concept in object-oriented programming, ensuring that derived classes can be used in place of their base classes without altering the correctness of the program.

——1963年6月25日在西德市政厅柏林墙前的演说

We are going to die, and that makes us the lucky ones. Most people are never going to die because they are never going to be born.

当每件事都是容易的时候，一个人很快的就会变的愚蠢。

The most important thing in directing is to have a clear vision of what you want to achieve.