“Choices are made in brief seconds and paid for in the time that remains.”

“People took what they wanted, they clutched at coincidences, the few there were, and made a life from them. . . . Choices are made in brief seconds and paid for in the time that remains.”

“By now he had learned. Choices are made in brief seconds and paid for in the time that remains. It had happened with Michela and then with Alice and again now. He recognized them this time: those seconds were there, and he would never make a mistake again.”

“She emptied herself of Fabio and of herself, of all the useless efforts she had made to get where she was and find nothing there. With detached curiosity she observed the rebirth of her weaknesses, her obsessions. This time she would let them decide, since she hadn't been able to do anything anyway. Against certain parts of yourself you remain powerless, she said to herself, as she regressed pleasurably to the time when she was a girl.”

“Numbers are everywhere," said Denis. "They're always the same, aren't they?""Yes.""But Alice is only here.""Yes.""So you've already made up your mind.”

“Prime numbers are divisible only by 1 and by themselves. They hold their place in the infinite series of natural numbers, squashed, like all numbers, between two others, but one step further than the rest. They are suspicious, solitary numbers, which is why Mattia thought they were wonderful. Sometimes he thought that they had ended up in that sequence by mistake, that they'd been trapped, like pearls strung on a necklace. Other times he suspected that they too would have preferred to be like all the others, just ordinary numbers, but for some reason they couldn't do it. This second thought struck him mostly at night, in the chaotic interweaving of images that comes before sleep, when the mind is too weak to tell itself lies.In his first year at university, Mattia had learned that, among prime numbers, there are some that are even more special. Mathematicians call them twin primes: pairs of prime numbers that are close to each other, almost neighbors, but between them there is always an even number that prevents them from truly touching. Numbers like 11 and 13, like 17 and 19, 41 and 43. If you have the patience to go on counting, you discover that these pairs gradually become rarer. You encounter increasingly isolated primes, lost in that silent, measured space made only of ciphers, and you develop a distressing presentiment that the pairs encountered up until that point were accidental, that solitude is the true destiny. Then, just when you're about to surrender, when you no longer have the desire to go on counting, you come across another pair of twins, clutching each other tightly. There is a common conviction among mathematicians that however far you go, there will always be another two, even if no one can say where exactly, until they are discovered.”

“In fact, they didn't talk much at all, but they spent time together, each in his own abyss, held safe and tight by the other's silence.”