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Definition from Dictionary, a free dictionary
Now and then it's good to pause in our pursuit of happiness and just be happy.Guillaume Apollinaire
Literally: people don't know, and ghosts don't feel
人不知，鬼不觉 (simplified, Pinyin rén bù zhī, guǐ bù jué, traditional 人不知，鬼不覺)
- something that is so mysterious, that it cannot be known by humans or felt by ghosts
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