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During the Spring and Autumn Period, Shusun Wushu, a grandee, boasted in the imperial court that Zigong was more sagacious than Confucius. Zifu Jingbo later relayed this conversation to Zigong.
Upon hearing it, Zigong laughed heartily and said, "A person's talent can be compared to the height of a palace wall. Duanmu Ci's (Zigong's personal name) wall is only shoulder-high. Confucius's wall, however, stands a thousand feet tall, and one cannot even find a gate to enter it. We are all inferior to him."
This idiom later came to describe someone whose learning is profound and extensive, making it difficult for ordinary people to reach or fully comprehend.

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Open the tool →宫墙重仞 (gōng qiáng zhòng rèn) is a Chinese idiom (chengyu) meaning “to describe profound scholarship or extensive knowledge that is so deep and vast it is beyond the comprehension or reach of ordinary people. It connotes unfathomable erudition”.
宫墙重仞 is pronounced gōng qiáng zhòng rèn in Mandarin Chinese.
Literally, 宫墙重仞 means “Palace walls of many 'ren' (an ancient unit of measurement)”. It is used to mean “to describe profound scholarship or extensive knowledge that is so deep and vast it is beyond the comprehension or reach of ordinary people. It connotes unfathomable erudition”.
宫墙重仞 comes from a classical Chinese story dating back to ancient China. The full story is on this page.
宫:宫殿;重:多;仞:古代长度单位,周时为八尺,汉时为七尺。比喻学问渊博,不可企及