 He also has a slight twist about who lies to whom, claiming that the lady lies to the speaker about her faithfulness, but he does not lie to her, only to himself, imagining that she believes him to be an "untutored youth".In the second quatrain, specifically in lines 5 and 6, the speaker declares he is aware that she knows he is no longer young.Beginning line 5 with the words "Thus vainly" effectively negates the second half of the line, implying that the lady does not actually believe in the speaker's youth.