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During the Eastern Han Dynasty, Yang Zhen, a prefect, was known for his integrity and incorruptibility, never accepting bribes.
Wang Mi, a county magistrate whom Yang Zhen had recommended, took advantage of the late night to bring him 10 catties of gold. Yang Zhen was very displeased.
Wang Mi said, "It's late at night, no one will know."
Yang Zhen replied, "Heaven knows, Earth knows, you know, and I know. I cannot accept this ill-gotten gain."

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Open the tool →暮夜无知 (mù yè wú zhī) is a Chinese idiom (chengyu) meaning “to act secretly”.
暮夜无知 is pronounced mù yè wú zhī in Mandarin Chinese.
Literally, 暮夜无知 means “Deep night, no one knows”. It is used to mean “to act secretly”.
暮夜无知 comes from a classical Chinese story dating back to modern Chinese. The full story is on this page.
黑夜无人知晓。