实现明天的唯一限制将是我们今天的疑虑。
The only limit to our realization of tomorrow will be our doubts of today.
The only failure is not trying.
The true teacher defends his pupils against his own personal influence.
真理总是存在于简单之中，而不是存在于事物的多样性和混乱之中。
You are not the opinion of somebody who doesn't know you or care about you.
True leadership means making tough decisions today that will benefit future generations.