They left the city and began to cross the bridge toward the treaty area. Tak Laleen passed her arms through theirs. She said, with sorrow in her voice, "No matter what we do, no matter how carefully we try to cushion the panic, we still have no way of being entirely sure of the results. Something that works with our prisoners or with us might destroy my world; it could send a planet into mass paranoia." "That risk is implied in all learning, Tak Laleen," Lanny answered. "We can never escape it. I'm not sure we ought to try. The individual who lives in a closed world of absolutes--shut in by prison walls of his own mind--is already insane. The sudden development of a new idea simply makes the condition apparent." "In a sense," Gill added, "there is no such thing as a teacher. There are people who expose us to data and try to demonstrate some techniques we can use, but any learning that goes on must come from within ourselves." "We will develop the most effective method we can," Lanny said. "Then we will apply it to your world, Tak Laleen. The rest is up to them. That's as it should be--as it must be." Arm in arm they crossed the bridge--two men and a missionary from an alien world. They had been enemies, but during a night of chaos and death they had learned to become men--the first men to catch the vision of the new world of the mind. Each of them was soberly aware that the discovery was not an end, but a beginning. And they faced that beginning with neither fear nor regret, because they had the confidence that comes of maturity. The unknown was not a god-power or a devil-power, but a problem to be solved by the skill of a rational mind.