“There were umpires everywhere, men who said who was winning or losing the theoretical battle, who was alive adn who was dead.The umpire had comical news. The congregation had been theoretically spotted from the air by a theoretical enemy. They were all theoretically dead now. The theoretical corpses laughed and ate a hearty noontime meal.Remembering this incident years later, Billy was struck by what a Tralfamadorian adventure with death that had been, to be dead and to eat at the same time.”

“The umpire had comical news. The congregation had been theoretically spotted from the air by a theoretical enemy. They were all theoretically dead now. The theoretical corpses laughed and ate a hearty noontime meal.”

“The people who actually make the advances in theoretical physics don't think in these categories that the philosophers and the historians of science subsequently invent for them”

“There may be coarse hypocrites, who consciously affect beliefs and emotions for the sake of gulling the world, but Bulstrode was not one of them. He was simply a man whose desires had been stronger than his theoretic beliefs, and who had gradually explained the gratification of his desires into satisfactory agreement with those beliefs. If this be hypocrisy, it is a process which shows itself occasionally in us all....”

“I am now convinced that theoretical physics is actual philosophy.”

“Theoretical considerations require that what is to-day the object of a phobia must at one time in the past have been the source of a high degree of pleasure.”