機關算盡太聰明，反算了卿卿性命 [机关－尽－聪－－－－－－－－－]
Jyutping
Pinyin
jī guān suàn jìn tài cōng ming , fǎn suàn le qīng qīng xìng mìng
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if one is too calculating, it will be the cause of one's own undoing (famous line in "A Dream of Red Mansions" 紅樓夢|红楼梦[Hong2 lou2 Meng4])