Answer:
To express that the author's 'Muse' (or inspiration) is gone
Explanation:
"Where art thou, Muse, that thou forget'st so long
To speak of that which gives thee all thy might?
Spend'st thou thy fury on some worthless song,
Darkening thy power to lend base subjects light?"
I can sorta guess that this is asking something like "Where are you Muse, did you forget about me for so long?"
The tone in the last stanza is regretful. The poem is about a man who received advice from a wise man that he can give away all his wealth but not his heart. He's told that once you give away your heart, you lose it and end up regretting it. He experiences it and regrets afterwards.
That the both have the letter e
I am pretty that it would be common knowledge.
Are there more options, I'm not sure if I understand what this means.