The only real voyage of discovery consists not in seeking new landscapes, but in having new eyes.
The essence of mathematics lies in its freedom.
Never forget why you started, and you can accomplish your mission. We must always keep in mind the mission of "dedicating oil to the motherland".
The only limit to our realization of tomorrow is our doubts of today.
独处的能力就是爱的能力。这看起来矛盾,但事实并非如此。
By used books. They have the same words as the new ones. Also libraries.