Facts are stubborn things; and whatever may be our wishes, our inclinations, or the dictates of our passion, they cannot alter the state of facts and evidence.

种荆棘会得到刺，种桃李会得到树荫。比喻善恶有报

我们的教学方法只有一个，就是必须维持孩子们的高度兴趣和强烈持续的注意力。

Truth is stranger than fiction, but it is because Fiction is obliged to stick to possibilities; Truth isn't.

So that morning in 1962 I told myself: Let everyone else call your idea crazy . . . just keep going. Don’t stop. Don’t even think about stopping until you get there, and don’t give much thought to where “there” is. Whatever comes, just don’t stop.