If you don't want others to know what you've done, you shouldn't have done it in the first place.
他私下里做了许多不光彩的事情，现在却想方设法掩盖，殊不知欲人勿知，莫若勿为。
He secretly did many discreditable things, and now he is trying every means to cover them up, unaware that if you don't want others to know, it's better not to do it at all.
Era:
Ancient
Frequency:
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