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.

我想解放美国，我希望人们为自己是谁而感到自豪。

Be scrupulously truthful, even when truth is inconvenient, for it is more inconvenient when you try to conceal it.

To live is to suffer, to survive is to find some meaning in the suffering.