Doctor, you don’t know what it is to doubt everything, even yourself. No, you don’t, you couldn’t with eyebrows like yours.
– Bram Stoker
Dracula, Chapter 14. Jonathan to Van Helsing, after the latter asks him if he was really alright after his wife Mina saying he was sick just a day ago. Jonathan explains that a lot of his sickness was self-doubt and not knowing if he could trust his senses after his experiences in Castle Dracula.