Hesitant to inform Utterson about his worries about Jekyll for fear that it will hurt him, demonstrates that he always has his master's best interests at heart when making decisions which concern him
Poole: '"O, sir… do you think I do not know my master after twenty years? Do you think I do not know where his head comes to in the cabinet door, where I saw him every morning of my life? No, sir, that thing in the mask was never Dr Jekyll."'
Poole: '"'Changed? Well, yes, I think so," said the butler. "Have I been twenty years in this man's house, to be deceived about his voice? No, sir; master's made away with'"'
Poole: '"You know the doctor's ways, sir," replied Poole, "and how he shuts himself up. Well, he's shut up again in the cabinet; and I don't like it, sir—I wish I may die if I like it. Mr. Utterson, sir, I'm afraid."'