Drunk, he bellowed 'Do you not see the Yellow River's waters come down from heaven' — pure bravado.
Tips
history
Opening couplet of 《将进酒》 by 李白 (Li Bai, Tang dynasty): '君不见黄河之水天上来,奔流到海不复回。' Pairs with a second 君不见 line about white hair in a mirror — youth and time, both rushing past.
usage
君不见 ('do you not see') is a classical apostrophe. Used today to open a dramatic quotation or to mock someone bloviating.