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。

要冒经过计算的风险，这与鲁莽完全不同。

The rule of law requires that laws be general, public, prospective, clear, and consistent.

Having less is more; contentment leads to happiness.

Tyranny will fall, freedom will endure.

Leadership is the art of getting someone else to do something you want done because he wants to do it.

The joy of chemistry is in seeing the invisible become visible.