To teach mathematics is to inspire the next generation of thinkers and problem solvers.

I don’t think you should ever have to apologize for your excitement.

成功的关键是专注于目标，而不是障碍。

【译文】不担心别人不了解自己，就怕自己没有能力。

Start where you are, with what you have. Make something of it. Never be satisfied.

The heart of animals is the foundation of their life, the sovereign of everything within them.

做大事和做小事的难易程度是一样的。所以要选择一个值得追求的宏伟目标，让回报与你的努力相匹配。