- Mary Justin: I'm not a very good person, Steven. I wanted your love - and I wanted Howard's affection and the security he could give me.
- Professor Steven Stratton: I can give you security too, and more than affection.
- Mary Justin: You don't really know me at all. My love isn't worth very much.
- Professor Steven Stratton: Do you remember once, I asked you how you could love me and yet marry someone else?
- Mary Justin: Yes, I remember.
- Professor Steven Stratton: Your marriage was bound to be a failure.
- Howard Justin: Don't you see that you two together are dangerous? You just have to keep away from one another. In the future, I'm going to see to it that you do.
- Howard Justin: Personally, Stratton, I think there is a fault in the Teutonic mind, which shows up whenever they have access to great power: Sort of... romantic hysteria. Well, perhaps not romantic, but a hysteria anyway, which seems to convert them from a collection of sober, intelligent, rather sentimental individuals, into a dangerous mob... a mob which can believe that a big enough lie is not a lie at all... but truth.