The greatness of a man is not in how much wealth he acquires, but in his integrity and his ability to affect those around him positively.

The truth is always something that is told, not something that is known.

I have the same goal I've had ever since I was a girl. I want to rule the world.

在观察性研究中，我们常常不得不依赖于无法直接检验的假设。