Read it through once

“If I could do that, simpleton, where would the danger be? Annihilated in a moment. Ever since I have known Mason, I have only had to say to him ‘Do that,’ and the thing has been done. But I cannot give him orders in this case: I cannot say ‘Beware of harming me, Richard;’ for it is imperative that I should keep him ignorant that harm to me is possible. Now you look puzzled; and I will puzzle you further. You are my little friend, are you not?”