"Jerry's always had the most fantastic way of getting into scrapes. Oh, we've had some grand laughs together. [about Daniel] I can't marry him because I'm still in love with that crazy lunatic and there's nothing I can do about it…I tried to forget Jerry."

"Put a light in the window if it's yes, two if it's no, and if you can't make up your minds, just pull down the shade."

"And then somehow, all of a sudden, the three of us were having lunch together. The man, and Mr. Smith [their dog], and I. And then things began to happen rather swiftly. And finally I said, well I think we'd better get married. And we did. And that way, we were able to give Mr. Smith a better home and live happily ever after. Until now."

"(You) can't have a happy married life if you're always going to be suspicious of each other…No one's interested in my night's adventure except Jerry and he knows it's innocent, just as well as he knows that, well, that he just got back from Florida."

"Well, if we haven't had the most terrible time. Armand's car broke down last night a million miles from nowhere and we had to stay at the nastiest little inn you ever saw. No modern conveniences at all. It was dreadful. We were on our way home from the Junior Prom. A pupil of Armand's invited us. And, oh well, it's a long story."

"[to Barbara] You can't have a happy married life if you're always suspicious. No. There can't be any doubts in marriage. Marriage is based on faith and if you've lost that, you've lost everything."

"[to Lucy] I certainly acted like a prized lunatic and I'm sorry…Nothing except the most ridiculous and sickening exhibition mortal man ever made of himself. Oh, I don't know why I act like that….The main idea is, do you accept my apology? Aside from making a blue-ribbon sap of myself today, I must have embarrassed you beyond words. You took it fine, though."

"Oh, I've heard everything. I'm going out to get some popcorn and pink lemonade. I've just seen a three-ring circus."

"[to Daniel] Take good care of her. Maybe you'll succeed where I failed. And I'm sure that the three of you will be very happy out where the West begins. If you ever think of me, send me a postcard. Just say, 'Having a wonderful time!' I'll understand."

"So you two are gonna be married. I was glad to hear that. I said to myself, 'That Leeson's just the man for Lucy.'"

"I wish Lucy would go out and get some fun for herself now and again. It would do her good. That's the trouble with most marriages today. People are always imagining things. The road to Reno is paved with suspicions. And the first thing you know, they all end up in a divorce court."

"Well, I'm gonna be tanned and Lucy's not gonna be embarrassed. And what wives don't know won't hurt them."

"I've gotta get a deep Florida tan if it takes all afternoon…All aboard for Miami, Palm Beach and points south."

"Just because I'm paranoid doesn't mean there isn't something in that backpack!"

"Hope Davis - Claire Llewellyn"

"Jake Gyllenhaal - Harold "Hal" Dobbs"

"Anthony Hopkins - Robert Llewellyn"

"Gwyneth Paltrow - Catherine Llewellyn"

"If you don't believe in yourself, who will believe in you?"

"The biggest risk in life is not taking one."

"Based on the Pulitzer Prize winning play by David Auburn"

"Things that are intangible are difficult to prove - sanity, love and faith"

"Mitch has become an excellent cook. It's like his hobby now. He buys all these gadgets, garlic, press, olive oil spread, every night there's something new. The other day he made the best vegetarian chili."

"It's a funeral, but we don't have to be completely grim about it!"

"I think the first thing I'm going to do is throw her in the shower and get her into the sun."

"Here's my suggestion, alright. I know three or four guys at the department, very sharp, disinterested people who knew your dad, knew his work. Let me take this to them, I'll tell them that we, we found something, something potentially major, we're not sure of the authorship, I'll sit down with them, we'll talk through it carefully, and then we'll figure out what we've got."

"It's a, a result, a proof. I mean, it looks like a proof - I mean, it IS a proof, a very long proof, I haven't read through it all yet, or checked it, I mean, I don't even know if I could check it... if it's a proof of what I think it's a proof of, it's a very important proof."

"I want to stay here with you. I want to spend the day with you. If at all possible, I want to spend as much time as I can, unless I'm coming on way too strong right now and scaring you, in which case I'll begin backpedalling immediately."

"I always liked you. But then I thought, no, you don't flirt with your doctoral advisor's daughter."

"[Reading Robert's notebook] "Talking with students helps, writing in buses. Most of all, Kathy. Her refusal to let me be institutionalised, caring for me herself, has certainly saved my life. Made writing this possible, made it possible to imagine doing math again. Where does her strength come from? I can never repay her. Today is her birthday, she is 24. I'm taking her to dinner.""

"When your dad was younger than both of us, he made major contributions to three fields! Game theory, algebraic geometry, non-linear operators... Look, if I came up with one tenth of the shit your dad produced, I could write my ticket to any math department, in the country."

"[voiceover] If I go back to the beginning, I could start it over again. I could go line by line, try and find a shorter way. I could try to make it... better."

"[On writing the proof] It was like, connecting dots. Some nights, I, I could connect, three or four of them, and some nights they'd be really far apart, I'd have no idea how to get to the next one, if there was the next one."

"[voiceover] How many days have I lost? How can I get back to the place where I started? I'm outside a house, trying to find my way in, but it's locked and the blinds are down, and I've lost the key, and I can't remember what the rooms look like or where I put anything. And if I dare go inside, I wonder, will I ever be able to find my way out?"

"You think you've figured something out? You run over here all pleased with yourself because you changed your mind, now you're certain? You don't know anything! The book, the math, the dates, the writing, all that stuff you just decided with your buddies, it's just evidence, it doesn't prove anything!"

"[If Catherine had written the proof] It would be a real disaster for you, wouldn't it? You and the other geeks who barely finish their PhDs, who are marking time doing lame research, bragging about the conferences they go to, wow. Playing in an awful band, and whining that they're intellectually past it at 26, because they ARE!"

"I didn't show this to anyone. I wanted you to be the first to see it, I didn't know I wanted that until last night. I trusted you. Was I wrong?"

"[Referring to proof] It is forty pages long. I didn't memorize it. It is not a muffin recipe!"

"I feel like I could crack open, like an egg, or one of those really smelly French cheeses that ooze out everywhere when you cut them."

"[Reading Robert's notebook] "Let X equal the quantity of all quantities of X. Let X equal the cold. It is cold in December. The months of cold equal November through February. There are four months of cold, and four of heat, leaving four months of indeterminate temperature. In February it snows. In March the lake is a lake of ice. In September the students come back and the bookstores are full. Let X equal the month of full bookstores. The number of books approaches infinity as the number of months of cold approaches four. I will never be as cold now as I will in the future. The future of cold is infinite. The future of heat is the future of cold. The bookstores are infinite and so are never full except in September...""

"Wow, I can't believe how many people are here, I never knew he had this many friends. Where have you all been for the last five years? I guess to you guys he was already dead, right? I mean, what's a great man without his greatness? Just some old guy... So, you probably want to catch up on what you missed out on. Um, he used to read all day, he kept demanding more and more books, I was getting them out of the library by the car load, there were hundreds. And then, one day, I realised, he wasn't reading: he believed aliens were sending him messages through the dewey decimal numbers in the library books. He was trying to work out the code. He used to, um, shuffle around in his slippers, he talked to himself. He stank. I had to make sure he bathed, which... was embarrassing. Oh, and then he started writing, nineteen, twenty hours a day, I got him this huge case of notebooks, he used every one. I dropped out of school. You see, he was convinced that he was writing the most beautiful, elegant proofs. Proofs, like music. I'm glad he's dead."

"I really don't need this, Claire. I'm fine, you know, I'm totally fine, and then you show up here with these questions like "Are you ok?" with that soothing tone of voice and "Oh, the poor policemen", I mean, I think the policemen can handle themselves. And bagels and bananas and jojoba, and "Come to New York!" and vegetarian chili?! I mean, it really pisses me off, so just save it!"

"There was an old man named Sidney... Who drank till he ruined a kidney. It shriveled and shrank, but he drank and he drank... He had his fun doing it, didn't he?"

"George Winslow - Henry Spofford III"

"Norma Varden - Lady Beekman"

"Taylor Holmes - Mr. Esmond Sr."

"Tommy Noonan - Gus Esmond"

"Elliott Reid - Ernie Malone"