From the opening passage of 《
论语·
学而》:
学而时习之,不亦说乎?有朋自远方来,不亦乐乎?人不知而不愠,不亦君子乎? (To learn and regularly practice - is that not a joy? To have friends come from afar - is that not a pleasure? To be unrecognized yet not resentful - is that not a gentleman?). The three rhetorical
不亦...乎 questions are among the most famous lines in all of Chinese literature, often memorized by schoolchildren.