"Mike, I'll go beyond your view to say that the Lithians are the most perfect example of how human beings ought to behave that we're ever likely to find, for the very simple reason that they behave now the way human beings once once behaved before we fell in our own Garden I'd go even farther: as an example, the Lithians are useless to us, because until the coming of the Kingdom of God no substantial number of human beings will ever be able to imitate Lithian conduct. Human beings seem to have built-in imperfections that the Lithians lack — original sin, if you like — so that after thousands of years of trying, we are farther away than ever from our original emblems of conduct, while the Lithians have never departed from theirs.

"And don't allow yourselves to forget for an instant that these emblems of conduct are the same on both planets. That couldn't ever have happened, either — but it did.

"I'm now going to adduce another interesting fact about Lithian civilization. It is a fact, whatever you may think of its merits as evidence. It is this: that your Lithian is a creature of logic. Unlike Earthmen of all stripes, he has no gods, no myths, no legends. He has no belief in the supernatural — or, as we're calling it in our barbarous jargon these days, the 'paranormal.' He has no traditions. He has no tabus. He has no faiths, except for an impersonal belief that he and his lot are indefinitely improvable. He is as rational as a machine. Indeed, the only way in which we can distinguish the Lithian from an organic computer is his possession and use of a moral code.

"And that, I beg you to observe, is completely irrational. It is based upon a set of axioms, a set of propositions which were 'given' from the beginning — though your Lithian sees no need to postulate any Giver. The Lithian, for instance Chtexa, believes in the sanctity of the individual. Why? Not by reason, surely, for there is no way to reason to that proposition. It is an axiom. Or: Chtexa believes in the right of juridical defense, in the equality of all before the code. Why? It's possible to behave rationally from the proposition, but it's impossible to reason one's way to it. It's given. If you assume that the responsibility to the code varies with the individual's age, or with what family he happens to belong to, logical behavior can follow from one of these assumptions, but there again One can't arrive at the principle by reason alone.

"One begins with belief: 'I think that all people ought to be equal before the law.' That is a statement of faith, nothing more. Yet Lithian civilization is so set up as to suggest that one can arrive at such basic axioms of Christianity, and of Western civilization on Earth as a whole, by reason alone — in the plain face of the fact that one cannot. One rationalist's axiom is another one's madness."

"Those are axioms," Cleaver growled. "You don't arrive at them by faith, either. You don't arrive at them at all. They're self-evident, that's the definition of an axiom."

"It was until the physicists kicked that definition to pieces," Ruiz-Sanchez said, with a certain grim relish. "There's the axiom that only one parallel can be drawn to a given line. It may be self-evident, but it's also untrue, isn't it? And it's self-evident that matter is solid. Go on, Paul, you're a physicist yourself. Kick a stone for me, and say, "Thus I refute Bishop Berkeley.'"

"It's peculiar," Michelis said hi a low voice, "that Lithian culture should be so axiom-ridden, without the Lithians being aware of it. I hadn't formulated it in quite these terms before, Paul, but I've been disturbed myself at the bottomless assumptions that lie behind Lithian reasoning — all utterly unprobed, although in other respects the Lithians are very subtle. Look at what they've done in solid-state chemistry, for instance. It's a structure of the purest kind of reason, and yet when you get down to its fundamental assumptions you discover the axiom: 'Matter is real.' How can they know that? How did logic lead them to it? It's a very shaky notion, in my opinion. If I say that the atom is just a-hole-inside-a-hole-through-a-hole, how can they controvert me?"

"But their system works," Cleaver said.

"So does our solid-state theory — but we work from opposite axioms," Michelis said. "Whether it works or not isn't the issue. The question is, what is it that's working? I don't myself see how this immense structure of reason which the Lithians have evolved can stand for an instant. It doesn't seem to rest on anything. 'Matter is real' is a crazy proposition, when you come right down to it; all the evidence points in exactly the opposite direction."

"I'm going to tell you," Ruiz-Sanchez said. "You won't believe me, but I'm going to tell you anyhow, because I have to. It stands because ifs being propped up. That's the simple answer and the whole answer. But first I want to add one more fact about the Lithians:

"They have complete physical recapitulation outside the body."

"What does that mean?" Agronski said.

"You know how a human child grows inside its mother's body. It is a one-celled animal to begin with, and then a simple metazoan resembling the fresh-water hydra or a simple jellyfish. Then, very rapidly, it goes through many other animal forms, including the fish, the amphibian, the reptile, the lower mammal, and finally becomes enough like a man to be born. I don't know how this was taught to you as a geologist, but biologists call the process recapitulation.

"The term assumes that the embryo is passing through the various stages of evolution which brought life from the single-celled organism to man, but on a contracted time scale. There is a point, for instance, in the development of the fetus when it has gills, though it never uses them. It has a tail almost to the very end of its time in the womb, and rarely it still has it when it is born; and the tail-wagging muscle, the pubococcygeus, persists in the adult — in women it becomes transformed into the contractile ring around the vestibule. The circulatory system of the fetus in the last month is still reptilian, and if it fails to be completely transformed before birth, the infant emerges as a 'blue baby" with patent ductus arteriosus, the tetralogy of Fallot, or a similar heart defect which allows venous blood to mix with arterial — which is the rule with terrestrial reptiles. And so on."

"I see," Agronski said. "It's a familiar idea; I just didn't recognize the term. I had no idea that the correspondence was that close either, come to think of it."

"Well, the Lithians, too, go through this series of metamorphoses as they grow up, but they go through it outside the bodies of their mothers. This whole planet is one huge womb. The Lithian female lays her eggs in her abdominal pouch, the eggs are fertilized, and then she goes to the sea to give birth to her children. What she bears is not a miniature of the marvelously evolved reptile which is the adult Lithian; far from it: instead, she hatches a fish, rather like a lamprey. The fish lives in the sea a while, and then develops rudimentary lungs and comes to live along the shore lines. Once it's stranded on the flats by the tides, the lungfish's pectoral fins become simple legs, and it squirms away through the mud, changing into an amphibian and learning to endure the rigors of living away from the sea. Gradually their limbs become stronger, and better set on their bodies, and they become the big froglike things we sometimes see down the hill, leaping in the moonlight, trying to get away from the crocodiles.

"Many of them do get away. They carry their habit of leaping with them into the jungle, and there they change once again, into the small, kangaroo-like reptiles we've all seen, fleeing from us among the trees — the things we called the 'hoppers.' The last change is circulatory — from the sauropsid blood system which still permits some mixing of venous and arterial blood, to the pteropsid system we see in Earthly birds, which supplies nothing to the brain but oxygenated arterial blood. At about the same time, they become homeostatic and homeothermic, as mammals are. Eventually, they emerge, fully grown, from the jungles, and take their places among the folk of the cities as young Lithians, ready for education.