出自北齐·颜之推《颜氏家训·文章》。书写文章要尊崇“三易”的原则，即文章内容要清晰明了，这是第一项。书写的文字要简单概要，这是第二项。书写的段落要读起来朗朗上口这是第三项。
The desire for recognition, the thymotic part of the soul, is the most fundamentally human part of the soul.
The most important thing in science is not to be afraid to ask questions.
My life has no direction, no aim, no meaning. And yet I'm happy.