“No, no,” the shyer man said, not at all shyly. “It’s not there like a couch or a house. Time isn’t space. You can’t walk around in it!” Vea nodded brightly, as if quite relieved to be put in her place. Seeming to gain courage from his dismissal of the woman from the realms of higher thought, the shy man turned to Dean and said, “It seems to me the application of temporal physics is in ethics. Would you agree to that, Dr. Shevek?”

“Ethics? Well, I don’t know. I do mostly mathematics, you know. You cannot make equations of ethical behavior.”

“Why not?” said Dearri.

Shevek ignored him. “But it’s true, chronosophy does involve ethics. Because our sense of time involves our ability to separate cause and effect, means and end. The baby, again, the animal, they don’t see the difference between what they do now and what will happen because of it. They can’t make a pulley, or a promise. We can. Seeing the difference between now and not now, we can make the connection. And there morality enters in. Responsibility. To say that a good end will follow from a bad means is just like saying that if I pull a rope on this pulley it will lift the weight on that one. To break a promise is to deny the reality of the past; therefore it is to deny the hope of a real future. If time and reason are functions of each other, if we are creatures of time, then we had better know it, and try to make the best of it. To act responsibly.”

“But look here,” said Dearri, with ineffable satisfaction in his own keenness, “you just said that in your Simultaneity system there is no past and future, only a sort of eternal present. So how can you be responsible for the book that’s already written? All you can do is read it. There’s no choice, no freedom of action left.”

“That is the dilemma of determinism. You are quite right, it is implicit in Simultanist thinking. But Sequency thinking also has its dilemma. It is like this, to make a foolish little picture—you are throwing a rock at a tree, and if you are a Simultanist the rock has already hit the tree, and if you are a Sequentist it never can. So which do you choose? Maybe you prefer to throw rocks without thinking about it, no choice. I prefer to make things difficult, and choose both.”

“How—how do you reconcile them?” the shy man asked earnestly.

Shevek nearly laughed in despair. “I don’t know. I have been working a long time on it! After all, the rock does hit the tree. Neither pure sequency nor pure unity will explain it. We don’t want purity, but complexity, the relationship of cause and effect, means and end. Our model of the cosmos must be as inexhaustible as the cosmos. A complexity that includes not only duration but creation, not only being but becoming, not only geometry but ethics. It is not the answer we are after, but only how to ask the question…”