Quote 1
"I see you feel as I do," said Mr. Enfield. "Yes, it's a bad story. For my man was a fellow that nobody could have to do with, a really damnable man; and the person that drew the cheque is the very pink of the proprieties, celebrated too, and (what makes it worse) one of your fellows who do what they call good. Black mail I suppose; an honest man paying through the nose for some of the capers of his youth. Black Mail House is what I call the place with the door, in consequence. Though even that, you know, is far from explaining all," he added, and with the words fell into a vein of musing. (1.10)
Dr. Jekyll and Mr. Hyde are set up as diametric opposites on the good/evil spectrum. We know this about them even before we know their names.
Quote 2
"No, sir: I had a delicacy," was the reply. "I feel very strongly about putting questions; it partakes too much of the style of the day of judgment. You start a question, and it's like starting a stone. You sit quietly on the top of a hill; and away the stone goes, starting others; and presently some bland old bird (the last you would have thought of) is knocked on the head in his own back garden and the family have to change their name. No sir, I make it a rule of mine: the more it looks like Queer Street, the less I ask."
"A very good rule, too," said the lawyer.
"But I have studied the place for myself," continued Mr. Enfield. "It seems scarcely a house. There is no other door, and nobody goes in or out of that one but, once in a great while, the gentleman of my adventure. There are three windows looking on the court on the first floor; none below; the windows are always shut but they're clean. And then there is a chimney which is generally smoking; so somebody must live there. And yet it's not so sure; for the buildings are so packed together about the court, that it's hard to say where one ends and another begins." (1.14)
Mr. Enfield actually is an inquisitive man, but he represses that aspect of his character because he thinks it is dangerous.
Quote 3
But there was one curious circumstance. I had taken a loathing to my gentleman at first sight. So had the child's family, which was only natural. But the doctor's case was what struck me. He was the usual cut and dry apothecary, of no particular age and colour, with a strong Edinburgh accent and about as emotional as a bagpipe. Well, sir, he was like the rest of us; every time he looked at my prisoner, I saw that Sawbones turn sick and white with desire to kill him. (1.8)
Despite Mr. Enfield’s self-professed lack of curiosity, he has an eye for picking out a "curious circumstance."