"The best way to learn mathematics is to do mathematics."

 如果一个人从确定性开始，最终将陷入怀疑；但如果他愿意从怀疑开始，最终将得到确定性。

The safest way to try and get what you want is to try and deserve what you want. It’s such a simple idea. It’s the golden rule so to speak. You want to deliver to the world what you would buy if you were on the other end.

"No hay nada más peligroso que una idea cuando es la única que se tiene."

数学不是关于数字、方程、计算或算法的：它是关于理解的。