From
李白 《梦游天姥吟留别》 (Li Bai, Tang, 745 CE), the poem's closing outburst after his ejection from the imperial court. Worldly pleasures are fleeting, all things flow east like water; how could the poet lower his brow and bend his waist to serve the powerful, and never again be free to smile? The line became the canonical motto of literati defiance.