The human being needs sadness as much as he needs joy.
人类需要悲伤，正如需要欢乐一样。
在科学中最令人兴奋的短语，预示着新发现的，不是“我发现了！”而是“这很有趣……”
The Romans would never have found time to conquer the world if they had been obliged first to learn Latin.
The mind is a mosaic of elementary processes.
In a globalized world, localized thinking is fatal.
Anger is a powerful force, but it can also be a creative one.