From Wang Anshi's (
王安石, Northern Song) 《
题张司业诗》, praising the plain style of Zhang Ji (
张籍):
看似寻常最奇崛,
成如容易却艰辛。(It looks ordinary, but is the strangest and steepest; achieving it looks easy, yet is full of hardship.) A canonical line on the hidden labor behind apparent simplicity — often cited in discussions of art, craft, and writing.