The history of mathematics is a history of human curiosity and ingenuity.
数学的历史是人类好奇心和创造力的历史。
The first duty of the sovereign， that of protecting the society from the violence and invasion of other independent societies， can be performed only by means of a military force.
The biggest risk is not taking any risk. In a world that’s changing quickly, the only strategy that is guaranteed to fail is not taking risks.