疯子永远不懂傻子
[fēng zi yŏng yuăn bù dŏng shă zi]
'A madman can never understand a fool'. Here, madness and foolishness have their respective meanings; it indicates that those acting unpredictably (madman) do not empathize with or comprehend those who make mistakes out of innocence or naivety (fool), suggesting there’s wisdom found even in apparent simplicity or ignorance.