人非生而知之者，孰能无惑

rén fēi shēng ér zhī zhī zhě , shú néng wú huòrenfeishengerzhizhizhe,shunengwuhuo

1. Knowledge is not innate to man, how can we overcome doubt?
2. We are not born with knowledge, how does one achieve maturity? (i.e. without guidance from a teacher - Tang dynasty essayist Han Yu 韓愈|韩愈[Han2 Yu4])

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