There is a sharp contrast between Silas and Dunstan though both of them desire gold.Explain.

Dunstan is nasty and Silas is not. Dunstan does not want to work for his wealth. Instead he schemes and steals even though he comes from a family of wealth. Dunstan has had a "silver spoon" so to speak for his entire life. Silas has worked for his money. He hoards it as a symbol of some kind of security. While Dunstan squanders the money that he gets, Silas lives humbly in order to keep what he makes.