From Han Yu's (
韩愈, Tang dynasty) 《
调张籍》, in which he defends Li Bai and Du Fu against their detractors:
蚍蜉撼大树,
可笑不自量 — 'An ant tries to shake a great tree — laughable that it knows not its own weight.' The line became the stock Chinese way to describe self-important weaklings attacking giants.