"Since I had already decided in favor of Galaxia, I felt I must be subliminally aware of flaws in Seldon's Plan, and those flaws could only be in the axioms, which were all I knew of the plan. Yet I could see nothing wrong with the axioms. I strove, then, to find Earth, feeling that Earth could not be so thoroughly hidden for no purpose. I had to find out what that purpose was.
"I had no real reason to expect to find a solution once I found Earth, but I was desperate and could think of nothing else to do. And perhaps Daneel's desire for a Solarian child helped drive me.
"In any case, we finally reached Earth, and then the moon, and Bliss detected Daneel's mind, which he, of course, was deliberately reaching out to her. She described that mind as neither quite human nor quite robotic. In hindsight, that proved to make sense, for Daneel's brain is far advanced beyond any robot that ever existed, and would not be sensed as simply robotic. Neither would it be sensed as human, however. Pelorat referred to it as 'something new' and that served as a trigger for 'something new' of my own; a new thought.
"Just as, long ago, Daneel and his colleague worked out a fourth law of robotics that was more fundamental than the other three, so I could suddenly see a third basic axiom of psychohistory that was more fundamental than the other two; a third axiom so fundamental that no one ever bothered to mention it.
"Here it is. The two known axioms deal with human beings, and they are based on the unspoken axiom that human beings are the only intelligent species in the Galaxy, and therefore the only organisms whose actions are significant in the development of society and history. That is the unstated axiom: that there is only one species of intelligence in the Galaxy and that it is Homo Sapiens. If there were 'something new;'** if there were other species of intelligence widely different in nature, then their behavior would not be described accurately by the mathematics of psychohistory and Seldon's Plan would have no meaning. Do you see?"
Trevize was almost shaking with the earnest desire to make himself understood. "Do you see?" he repeated.
Pelorat said, "Yes, I see, but as devil's advocate, old chap-"
"Yes? Go on."
"Human beings are the only intelligences in the Galaxy."
"Robots?" said Bliss. "Gaia?"
Pelorat thought awhile, then said hesitantly,** "Robots have played no significant role in human history since the disappearance of the Spacers. Gaia has played no significant role until very recently. Robots are the creation of human beings, and Gaia is the creation of robots-and both robots and Gala, insofar as they must be bound by the Three Laws, have no choice but to yield to human will. Despite the twenty thousand years Daneel has labored, and the long development of Gaia, a single word from Golan Trevize, a human being, would put an end to both those labors and that development. It follows, then, that humanity is the only significant species of intelligence in the Galaxy, and psychohistory-remains valid."
"The only form of intelligence in the Galaxy," repeated Trevize slowly. "I agree. Yet we speak so much and so often of the Galaxy that it is all but impossible for us to see that this is not enough. The Galaxy is not the universe. There are other galaxies."
Pelorat and Bliss stirred uneasily. Daneel listened with benign gravity, his hand slowly stroking Fallom's hair.
Trevize said, "Listen to me again. Just outside the Galaxy are the Magellanic Clouds, where no human ship has ever penetrated. Beyond that are other small galaxies, and not very far away is the giant Andromeda Galaxy, larger than our own. Beyond that are galaxies by the billions.
"Our own Galaxy has developed only one species of an intelligence great enough to develop a technological society, but what do we know of the other galaxies? Ours may be atypical. In some of the others-perhaps even in all-there may be many competing intelligent species, struggling with each other, and each incomprehensible to us. Perhaps it is their mutual struggle that preoccupies them, but what if, in some galaxy, one species gains domination over the rest and then has time to consider the possibility of penetrating other galaxies.
"Hyperspatially, the Galaxy is a point-and so is all the Universe. We have not visited any other galaxy, and, as far as we know, no intelligent species from another galaxy has ever visited us-but that state of affairs may end someday. And if the invaders come, they are bound to find ways of turning some human beings against other human beings. We have so long had only ourselves to fight that we are used to such internecine quarrels. An invader that finds us divided against ourselves will dominate us all, or destroy us all. The only true defense is to produce Galaxia, which cannot be turned against itself and which can meet invaders with maximum power."
Bliss said, "The picture you paint is a frightening one. Will we have time to form Galaxia?"
Trevize looked up, as though to penetrate the thick layer of moonrock that separated him from the surface and from space; as though to force himself to see those far distant galaxies, moving slowly through unimaginable vistas of space.
He said, "In all human history, no other intelligence has impinged on us, to our knowledge. This need only continue a few more centuries, perhaps little more than one ten thousandth of the time civilization has already existed, and we will be safe. After all," and here Trevize felt a sudden twinge of trouble, which he forced himself to disregard, "it is not as though we had the enemy already here and among us."
And he did not look down to meet the brooding eyes of Fallom-hermaphroditic, transductive, different-as they rested, unfathomably, on him.