Be thankful for what you have; you’ll end up having more. If you concentrate on what you don’t have, you will never, ever have enough.
In mathematics, the art of proposing a question must be held of higher value than solving it.
勤俭了就有了约束,有约束了就会各种好事都做;奢侈就放肆,放肆则各种坏事都泛滥。
América Latina es el continente de la utopía y la nostalgia.
The most elegant mathematical proofs are those that reveal truth with simplicity.