"It's worse than that," Camberton said, chuckling softly. "Or, actually, it's much better."
"I don't understand; explain it to me. I'm an old man, and I may not live to see my world collapse. I hope I don't."
Camberton said: "I'll try to explain in words, Senator. They're inadequate, but a fuller explanation will come later."
And he launched into the story of the two-decade search of Paul Wendell.
Coda—Andantino
"TELEPATHY? Time travel?" After three hours of listening, the ex-President was still not sure he understood.
"Think of it this way," Camberton said. "Think of the mind at any given instant as being surrounded by a shield—a shield of privacy—a shield which you, yourself have erected, though unconsciously. It's a perfect insulator against telepathic prying by others. You feel you have to have it in order to retain your privacy—your sense of identity, even. But here's the kicker: even though no one else can get in, you can't get out!
"You can call this shield 'self-consciousness'—perhaps shame is a better word. Everyone has it, to some degree; no telepathic thought can break through it. Occasionally, some people will relax it for a fraction of a second, but the instant they receive something, the barrier goes up again."
"Then how is telepathy possible? How can you go through it?" The Senator looked puzzled as he thoughtfully tamped tobacco into his briar.
"You don't go through it; you go around it."