Answer:
The oxymoron creates a contradictory mood, emphasizing the confused nature of love.
Explanation:
The oxymoron is a figure of speech that allows to present a paradox in the text, that is, the oxymoron presents in the same sentence, two contrary information, but that are complemented in some way.
In the text presented above, the oxymoron is seen in the lines "the sweetest honey / Is loathsome in his own deliciousness". With this sentence, the author creates a contradictory mood, but presents a characteristic love as something confused, but pleasurable.