里氏替换原则是面向对象编程中的一个基本概念，它指出子类的对象应该能够替换超类的对象而不影响程序的正确性。

A Book of Verses underneath the Bough, A Jug of Wine, a Loaf of Bread—and Thou Beside me singing in the Wilderness— Oh, Wilderness were Paradise enow!

He who knows only his side of the case knows little of that.

You don't need to be perfect to inspire others. Let people get inspired by how you deal with your imperfections.

不为苏联解体而惋惜的人没有良心，想恢复苏联的人没有头脑。

We are what we pretend to be, so we must be careful about what we pretend to be.

"Stories can help children understand the world and themselves."

我离开船不能超过一天，因为我是船上唯一能导航的人。