Oi. Is this Hamlet?? (the toad living in a dungeon reminds me of hamlet)
Pretty sure this is Othello :3
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I think it would be best to first introduce it by looking at the soliloquy as a whole - then go into specific detail with the quote, as this would count as a dramatic technique. Depending on the argument you're looking to portray, could possibly expand upon how it shows the extent of Iago's influence on Othello.
'these delicate creatures' - 'delicate' highlights perception of the fragility of femininity; 'creatures' - metaphor, develops a sense of isolation between men and women in marriage, shows how Othello begins to belittle the value of the institution of marriage - his doubts
'and not their appetites!' - contrast between earlier notion of ownership, punctuation (exclamation mark) denotes tone - disbelief, builds upon his mistrust
'toad' - animal imagery, could connect this to earlier parts of the soliloquy - willingness to degrade himself for love
'keep a corner' - metaphor, dictating ownership of Desdemona, him wanting to keep her to himself - emphasises ideal of relationships