The most important thing in science is not to stop questioning.
You can't cross the sea merely by standing and staring at the water.
今天很残酷,明天更残酷,后天很美好,但绝大部分人是死在明天晚上,看不到后天的太阳。
历史学家必须是诗人,不是为了创造,而是为了重新创造。