From Liu Yuxi's 《
酬乐天扬州初逢席上见赠》 (Tang dynasty, 826), written after 23 years of political exile when he finally met his friend Bai Juyi in Yangzhou:
沉舟侧畔千帆过,
病树前头万木春。 Bai Juyi had sympathized with Liu's ruined career — Liu's reply was defiant: the world moves on, and so will he.