Dracula by Bram Stoker

28 September. It is wonderful what a good night's sleep will do for one. Yesterday I was almost willing to accept Van Helsing's monstrous ideas; but now they seem to start out lurid before me as outrages on common sense. I have no doubt that he believes it all. I wonder if his mind can have become in any way unhinged. Surely there must be _some_ rational explanation of all these mysterious things. Is it possible that the Professor can have done it himself? He is so abnormally clever that if he went off his head he would carry out his intent with regard to some fixed idea in a wonderful way. I am loath to think it, and indeed it would be almost as great a marvel as the other to find that Van Helsing was mad; but anyhow I shall watch him carefully. I may get some light on the mystery.

29 September, morning._.... Last night, at a little before ten o'clock, Arthur and Quincey came into Van Helsing's room; he told us all that he wanted us to do, but especially addressing himself to Arthur, as if all our wills were centred in his. He began by saying that he hoped we would all come with him too, "for," he said, "there is a grave duty to be done there. You were doubtless surprised at my letter?" This query was directly addressed to Lord Godalming.