理解他人，现实的唯一方法是自己去体验。
We teach a subject not to produce little living libraries on that subject, but rather to get a student to think mathematically for himself.
The world is full of magic things, patiently waiting for our senses to grow sharper.
Mexico is a country that is always in the process of becoming, never quite arriving.
The beauty of mathematics lies in its ability to connect seemingly unrelated ideas.