Who says a blade of grass could repay the spring sun? - gratitude on Mother's Day.
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history
From the closing couplet of the Tang poet Meng Jiao's 孟郊《游子吟》 (Song of the Wandering Son): 谁言寸草心,报得三春晖. An inch-tall blade of grass stands for a child's slight devotion, the warm spring sun for the vast depth of a mother's love.
usage
Always paired with the following line 报得三春晖. Together the couplet is the most famous pair of lines in Chinese poetry on a mother's love.