The only source of knowledge is experience.
知识的唯一来源是经验。
我们必须始终质疑我们的假设，并愿意根据新的证据修正我们的理解。
Parents wonder why the streams are bitter, when they themselves have poisoned the fountain.
"To understand a person, you must first understand their silence."
You can't power a nation on wishful thinking.