刽开顽石方知玉，淘尽泥沙始见金。
释义：只有经过艰苦的努力和考验，才能发现或创造出价值重大的事物。
Civilization will not last, freedom will not survive, peace will not be kept, unless a very large majority of the people unite to defend them.
For the past 33 years， I have looked in the mirror every morning and asked myself: 'If today were the last day of my life， would I want to do what I am about to do today？' And whenever the answer has been 'No' for too many days in a row， I know I need to change something.
The spirit of science lies in constant questioning and exploration, keeping us forever curious about the world.