The imagery that Poe uses to help you hear, see, smell, and feel the sensations of being buried alive is like I could feel myself gasping for air as he described this scene to me. I could see myself in the middle of tons of dirt, smelling the dust. I could hear the dirt getting piled on top of me.
Simon Finch made money by practicing medicine and he made a living out of cotton.
Dialogue can show the reader how the character thinks, interacts with others, communicates, and possibly even where the character is from and/or their educational level.