Answer:
it shows that sweetners did not need to be the product of sugar plantations and slavery..
<em><u>hope</u></em><em><u> </u></em><em><u>it</u></em><em><u> </u></em><em><u>helps</u></em><em><u> </u></em><em><u>you</u></em>
<em><u>Th</u></em><em><u>a</u></em><em><u>n</u></em><em><u>k</u></em><em><u> </u></em><em><u>you</u></em>
It gives comic relief, probably.
Short Answer: comic Relief
You have to read around this speech a little bit. Mephistopheles (a demon pretty high up in "the organization") comes in and Faustus makes the comment after all his incantations (which is above your quotation) that he (Meph) is really ugly and is better suited being an old Franciscan Friar -- not a thing you would expect a devil to be.
It's wit and an audience member would smile wryly at the comment. It is not belly shaking laughter. It is just wit, sharp and pointed. (Sort of like the devil himself).
Answer: Comic Relief
One other comment. Try fitting any other answer into those two lines. None of them will work.
At the end of the poem, we hear:
I took the one less traveled by,
And that has made all the difference.
- So we can see that the last two options are true: individual goals and new experiences are valuable (great poem btw)