在危机时刻，真正的领导力是通过行动而非言语展现的。

我不相信运气，我相信准备。

The Vietnamese people deeply love independence, freedom, and peace. But in the face of a threat to their country's independence and freedom, the Vietnamese people would rather sacrifice everything, not afraid to lose their lives, to defend the independence and freedom of their homeland.

数学的力量来自于它的抽象和概括能力，将具体问题转化为普遍真理。