That phrase is a famous teaching from Jesus in the Bible (Matthew 7:3-5), meaning you should first fix your own big faults (the "plank") before trying to correct someone else's smaller faults (the "speck"), or you're a hypocrite; only after removing your own beam can you truly see clearly to help your brother, emphasizing self-reflection and humility before judgment, as stated in Matthew 7:3-5 and Matthew 7:3-5.

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Remove the plank from your own eye Matthew 7:1–5 (NKJV ...

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