“It was another of the things he had left behind, another obvious step in a boy's life that he had decided not to take, so as to stay as far as possible from the machinery of life.”

“No, what she had in front of her was a grown-up person who had built a life around a terrifying abyss, on terrain that had already collapsed, and yet who had succeeded, far away from here, among people Alice didn't know.”

“this meant he had reached the end of the track that he had blindly followed from the first year of primary school to graduation.”

“She couldn't remember what they had talked about, only that she had looked at her rapt from a place just behind her eyes, a place full of jumbled thoughts that she had kept to herself even then.”

“The whole house, its very walls, was impregnated with a smell of vitality that he was unused to. He thought about his own apartment, where it was so easy to decide simply not to exist.”

“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.Mattia thought that he and Alice were like that, twin primes, alone and lost, close but not close enough to really touch each other. He had never told her that. When he imagined confessing these things to her, the thin layer of sweat on his hands evaporated completely and for a good ten minutes he was no longer capable of touching anything.”

“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.”