“You're not going to make me promise you something, because that's what they say in the movies, the person who never comes back.”

“I did know what it meant when you say you promise something. You have to say that you will never do something again and then you must never do it because that would make the promise a lie.”

“What's your favorite movie?...that should be our question. When we don't know what to say. Movies are a safe topic. What's wrong with the standard 'how's it going?' because all you get is 'Okay' or 'Fine', and then what? You're back where you started. It's a useless question. Like anyone is going to tell you how it's really going.”

“If anybody thinks they should listen to me because I'm a professor at MIT, that's nonsense. You should decide whether something makes sense by its content, not by the letters after the name of the person who says it.”

“And so a person can never promise to love someone forever because you never know what might come up, what terrible thing the person you love might do.”

“You forget: I have an addictive personality. I'm addicted to you. Somehow I think you could do all sorts of bad things to me, and I'd still come back to you. Just keep things honest, okay? Tell me what you're feeling. If you're feeling something for Dimitri that's confusing you, tell me. We'll work it out.”