Dracula by Bram Stoker Chapter 15 Page 32

“I want your permission to do what I think good this night. It is, I know, much to ask, and when you know what it is I propose to do you will know, and only then how much. Therefore may I ask that you promise me in the dark, so that afterwards, though you may be angry with me for a time, I must not disguise from myself the possibility that such may be, you shall not blame yourselves for anything.”

“That's frank anyhow,” broke in Quincey. “I'll answer for the Professor. I don't quite see his drift, but I swear he's honest, and that's good enough for me.”

“I thank you, Sir,” said Van Helsing proudly. “I have done myself the honor of counting you one trusting friend, and such endorsement is dear to me.” He held out a hand, which Quincey took.