Behind abnormal data there may be something hidden - it must not go unexamined.
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history
The doubled negative 不可不 ('cannot not') makes for strong affirmation, equal to 'must.' The X 不可不察也 warning frame, urging careful discrimination, is a recurring classical formula in pre-Qin philosophical and strategic texts.
usage
不可不…… is a Classical Chinese double-negative pattern of emphasis, equal to 必须 (must). Strongly literary in flavor; today mostly seen in commentary, opinion writing, and policy documents.
