The most important thing in mathematics is to understand the concepts, not just to memorize the formulas.
The greatest legacy we can leave is a healthier planet for future generations.
心灵是一个协调活动的系统。
Swear by your product. If you don't, no one else will.
The function of thought is to guide action.
受过教育的心灵的标志是能够思考一种思想而不必接受它。
积极情绪不是微不足道的奢侈品,而是最佳功能的关键必需品。
It’s not about money.It’s about the people you have, how you’re led, and how much you get it.