过去是一个跟随我们的影子，但让它定义我们是我们的选择。
The past is a shadow that follows us, but it is our choice whether to let it define us.
"Theology is a language of the heart, not of the head."
I am following nature without being able to grasp her.
译文：贫穷的人不用学俭朴，自会俭朴，卑贱的人不用学谦恭，自会谦恭。
Mathematics is not about numbers, equations, computations, or algorithms: it is about understanding.
数学不是关于数字、方程、计算或算法：它是关于理解的。
我总是说，“如果你时刻准备着，就不需要临时准备。”