JLPT N1Proverbs

管を以て天を窺う

Meaning
細い管から覗くように、狭い見識で広大な物事を判断すること
Explanation
Like peering at the vast sky through the hole of a thin tube, it is a phrase that warns against the folly of judging great matters with a narrow, biased view. In contrast to c3, which preaches the importance of taking a comprehensive overview, the key point here is that it criticizes narrowness of vision.
Original Japanese explanation

細い管の穴から広い空を覗くように、狭く偏った見識で大きな物事を判断する愚かさを戒めることば。全体を俯瞰する大切さを説く c3 とは対照的で、こちらは視野の狭さを批判している点が要点です。

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