Iago was urging Roderigo to make as much money as he can and to save it up, supposedly so that Roderigo will then have the funds to pursue and woo Desdemona.
However, Iago goes on to say to himself in private, 'Thus do I ever make my fool my purse,' which suggests he actually intends to use the money Roderigo saves for his own purpose.
Thank you that completes my enquiries for now the othello answer was a great thank you, Dickens not really answered, but I agree Dickens did like to play with names, it's just annoying trying to work them out.
There is also a sexual play on words here, as the word 'purse' also meant the female sexual organs...a double entendre. He is fooling the other characters by means of manipulating their perception of female sexuality...their 'purse'.
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Thank you Crokepark, I needed to source that last explanation and now I shall be able to. Brilliant. added webs to favourites. Any Ideas on Seamus Heaney?