"Always be learning. The world is constantly changing, and you need to keep up."
Always look at what you have left. Never look at what you have lost.
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.
最成功的社会是那些允许最大程度个人自由和创造力的社会。
——1963年6月25日在西德市政厅柏林墙前的演说
"I write to escape the mirror, but I always end up finding it."
