Be brave, take risks, nothing can substitute experience.
勇敢一点，冒险一试，没有什么能替代经验。
在计算复杂性的研究中，我们常常发现可能的边界是由我们想象力的极限定义的。
数学不仅仅是关于数字、方程、计算或算法：它是关于理解的。
Sustainability isn't an option—it's a responsibility we owe to future generations.
"Theologians talk about a prevenient grace that precedes grace itself and allows us to accept it. I think there must also be a prevenient courage that allows us to be brave - that is, to acknowledge that there is more beauty than our eyes can bear, that precious things have been put into our hands and to do nothing to honor them is to do great harm."