In Shakespeare's The Merchant of Venice, please explain Shylock's rhetoric as he uses metaphor and repetition.

Whenever an author, or character, uses literary devices such as metaphors and repetitive language, it is done in an effort to create a mental image in the mind of the audience (or other character) for the sake of deeper understanding, and/or to drive home a point, message, or theme. Shylock does this masterfully because he wants the Christians to know and understand how they continue to make him and his fellow Jews suffer. For example,...

Whenever an author, or character, uses literary devices such as metaphors and repetitive language, it is done in an effort to create a mental image in the mind of the audience (or other character) for the sake of deeper understanding, and/or to drive home a point, message, or theme. Shylock does this masterfully because he wants the Christians to know and understand how they continue to make him and his fellow Jews suffer. For example, before Shylock loans three-thousand ducats to Antonio, he reminds him how he has treated him in public in the past. During Shylock's discourse, he repeats the words you, money, dog, and cur because he doesn't want Antonio to forget the connection he is now making between hurting Shylock and needing to borrow money from him.

"You come to me, and you say

'Shylock, we would have moneys'--you say so,

You, that did void your rheum upon my beard,

And foot me as you spurn a stranger cur

Over your threshold. Moneys is your suit.

What should I say to you? Should I not say

'Hath a dog money? is it possible

A cur can lend three thousand ducats?'" (I.iii.111-118).

Basically, Shylock is telling Antonio that it is ironic that he needs money from someone he has spit upon and called a dog and a cur. He wants Antonio to recognized the irony and wallow in it for all the suffering he has caused Shylock in the past. Shylock uses the metaphor of him being compared to a dog because not only is that what Antonio has called him before, but now the high and mighty Antonio is seeking help from said dog. Shylock, again, then uses the repetition of the above-mentioned words in order to drive home the point of this ironic business transaction.