My belt grows looser and I have no regrets - for her sake I'll let myself waste away.
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From 柳永's 《蝶恋花·伫倚危楼风细细》 (Northern Song ci): 衣带渐宽终不悔，为伊消得人憔悴. Originally a love poem - the speaker grows thin from longing for a distant beloved. 王国维 in 《人间词话》 elevated it to the ‘second of three realms’ of scholarly achievement, giving it a completely new life as a phrase about devoted effort.
usage
Always cited with its second half 为伊消得人憔悴. 终 = ultimately / to the end; 悔 = regret. Widely quoted in essays about perseverance in study or career.
