"Courage is not the absence of fear, but the will to act in spite of it."
"The truth is rarely simple, and it’s often more painful than the lies we tell ourselves."
手会记住头脑忘记的东西。
To do mathematics is to explore a universe of ideas, where the only limit is your imagination.
The coal industry has been the backbone of America's energy independence for generations.
The best and most beautiful things in the world cannot be seen or even touched - they must be felt with the heart.
Courage to fail is just as important as the will to succeed.
Mathematics is the art of giving the same name to different things.