GOM, the “you must believe it to see it” phrase is a twist on “you must see it to believe it,” of course, but it refers to the apparent tendancy of some people to, once they believe in some fantastic phenomena, to readily accept or observe related events that would be invisible, illogical, or irrational to non-believers. A parallel can be drawn to many religious concepts.
In brief, the mind of the True Believer operates differently from others.
Oh, dear, I didn’t explain that too well. Here’s a link that might illustrate the concept, although that’s not much better.
RE: Physical travel vs. radio communication
I see your point, (and I just put my spare cash in klorpflecks, so I hope the exchange rate is favorable) but…
You are looking at all communication as a two-way thing. Great distances make a dialogue difficult, sure, but physical travel between these same two points would take A LOT longer. A trade route would be pretty darn dicey.
If communication is one-way, the same thing is true. Radio travels faster than spaceships. If you want to make your presence known across the universe, a broadcast would be the most efficient way to make announcements.
So are you suggesting that an alien civilization, with a self-contained life-support system, and after traveling for an immense amount of time, has arrived near Earth and is hovering, making peroidic forays to attempt to talk to eathlings thru crypic crop circles?
I don’t buy it. If they are so gosh-darn advanced, is stomping on our wheat and hoping we can guess their intentions the best they can do?