《三国志·魏书·王卫二刘傅传》
万物不向天地表示回报，孩子不向父母表示生养的感谢，因为这些只能用生命证明，很那用笔陈述出来。 
物不答施於天地，子不谢生於父母，可以死效，难用笔陈。 
All things do not show gratitude to heaven and earth, and children do not express gratitude to their parents for their birth, because these can only be proved by life, and it is difficult to express them in writing.