The poem being identified here is : to the doctor who treated the raped baby and who felt such despair
It is raising a note and upholding a certain emotion of disgust to the doctor's behavior. This is achieved by the speaker's tone, use of words and the ethos. Moreover, ethos speaks of the character's credibility or the persuader's credibility of what he or she is asserting and positing, is it strong and bold or just a mere existent elaboration. Thus follows the characteristics on tone, logos and pathos. Ethos is one key to trusting since it presents one's consistency and as a reliable speaker.
