有时候你做了所有正确的事情，事情仍然会出错。关键是要永远不要停止做正确的事情。
Sometimes you can do everything right and things will still go wrong. The key is to never stop doing right.
A building should grow from its site like a tree from the earth.
越南人民深深热爱独立、自由与和平。但在面对国家独立和自由受到威胁时，越南人民宁愿牺牲一切，不惜失去生命，也要捍卫祖国的独立和自由。
The most important thing in mathematics is to understand the concepts, not just to memorize the formulas.