 What does Simon think about the possibility of time travel?
He looked over at Betty and said, almost as though reciting, "What I need is a vacation." "Providence," Simon told her whilst fiddling with the aspirin bottle, "will provide." Simon said, enigmatically, "Now it comes." The client fussed himself with Betty's assistance into the seat, bug-eyed Simon, said finally, "You know my name, that's pretty good. When Simon continued to say nothing she ventured, "Time travel is impossible." "Time travelers," she said, not very intelligently. "Then you'll realize that there are a dozen explanations of the paradoxes of time travel. It's my contention that within a century or so man will have solved the problems of immortality and eternal youth, and it's also my suspicion that he will eventually be able to travel in time. So convinced am I of these possibilities that I am willing to gamble a portion of my fortune to investigate the presence in our era of such time travelers." Simon seemed incapable of carrying the ball this morning, so Betty said, "But ... Mr. Oyster, if the future has developed time travel why don't we ever meet such travelers?" "The usual explanation, Betty, is that they can't afford to allow the space-time continuum track to be altered. If, say, a time traveler returned to a period of twenty-five years ago and shot Hitler, then all subsequent history would be changed. In that case, the time traveler himself might never be born. Mr. Oyster returned his glasses to their perch, bug-eyed Simon, but then nodded. Simon said, "You want to hire me to find a time traveler and in some manner or other—any manner will do—exhort from him the secret of eternal life and youth, which you figure the future will have discovered. Now she said, plaintively, "But where are you going to find one of these characters—especially if they're interested in keeping hid?" You could be a four-armed space traveler from Mars, and you still wouldn't be conspicuous at the Oktoberfest . If you could go back a few thousand years, the things you would wish to see would be a Roman Triumph, perhaps the Rites of Dionysus, or one of Alexander's orgies. You can take the plane to Munich, spend a week there and—" Simon was shaking his head.
 He knows that it's real, but thinks that its secret will be kept in the future.
 He thinks it's possible, but finds it ridiculous that Oktoberfest would be the place to find it.  He hopes that it's real, and spends a lot of time thinking about how to avoid a paradox.  He knows that it's real, but thinks that its secret will be kept in the future.  He thinks it's incredibly stupid and not worth considering.