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The truth is rarely pure and never simple.

Take note if you find yourself wondering “Where is my good knife？ Or， where is my good pen？” That means you have bad ones. Get rid of those.

解釋：人不博覽群書，不了解古今，不能識別世間事物，不知道是與非，就像盲人看不到顏色?、聾人聽不到聲音、鼻塞的人聞不到花香一樣啊。