Success is not the key to happiness. Happiness is the key to success. If you love what you are doing, you will be successful.
爱和争斗是宇宙中的两大原则,它们推动了一切变化。
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。