(classical particle similar to 於|于[yu2]) in / at / from / because / than / (classical final particle similar to 嗎|吗[ma5], 吧[ba5], 呢[ne5], expressing question, doubt or astonishment)
Knowledge is not innate to man, how can we overcome doubt? / 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)
毫不怀疑
háo bù huái yí
without the slightest doubt
疑冰
yí bīng
ignorant / doubt stemming from ignorance / (a summer insect has no word for ice, Zhuangzi 莊子|庄子[Zhuang1 zi3])
Knowledge is not innate to man, how can we overcome doubt? / 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])