"Unless you people see signs and wonders, you will by no means believe."
What I find interesting about this quote from Jesus is that the man who had just spoken to him had travelled quite a ways (at least a day's journey) to find Jesus and implore Him to heal his son. He certainly believed in Jesus' power to heal, otherwise he wouldn't have bothered to travel and find Him. What he didn't believe was that Jesus was the Christ. I find this comment interesting, because this man didn't seem like he believed anything but that there was a miracle-worker in the neighborhood, and Jesus knew it. And so Jesus stated as much. Interesting also, is Jesus' response immediately following that comment: "Go your way; your son lives."

Yes, the man believed in nothing other than a miracle-worker. Yes, he wanted nothing other than to have his son healed. And yes, he would leave after he got what he wanted (I doubt this man wanted to leave his wife and family and follow Jesus as an itinerant disciple). Jesus knew this, and yet He still healed the nobleman's son.

So the man believed the word
Also interesting is that this man took Jesus' word for it. He didn't continue to implore Jesus to come down and touch his son, heal him before his very eyes. He simply said, "Ok. If you say it, I'll believe it. Thanks," and went about his way back home completely by faith. Then lo and behold, his servants come and tell him that his son has been healed at the exact time Jesus' said the boy was healed, and Boom, the man and his entire household believe. Not believe, as in "This guy is a miracle-worker," but as in, "This guy is the miracle-worker, the Christ." Still, my question is "would he have believed Jesus to be the Christ without that sign?" I'd say "No." After all, Jesus said as much to him before He sent him on his way. This man needed a sign, Jesus gave him one, and he and his entire household believed that Jesus was the Messiah. Without that sign, he might simply have been excited about a miracler-worker running through the Galilean countryside, and not given the Messiah bit any more thought. Sign needed, sign given, belief happened. End of story.

The fence riding bit
So what's the difference between this man, and the people who are waiting for God to drop a bomb in their laps? After all, both need - or want - a sign. The key difference, I think, is that the man had a bomb dropped in his lap and was told, "It exploded in your lap." And yet, without seeing the explosion, he chose to believe that the bomb in his lap had exploded. And sure enough, it did. Without that initial movement, he probably wouldn't have believed. Think about it: if the nobleman had kept pestering Jesus with the demand that he come and physically heal his son before his eyes, he would have missed the opportunity to believe the sign: he would have pestered Jesus for a miracle until his servants found him and told him that his son had gotten better, and he would have written off the healing to sheer length of time and a good immune system and completely forgotten Jesus' words that his son had already been healed. True, the explosion still happened, it's just that the nobleman wouldn't have noticed it if he hadn't moved.

The fence rider is waiting to actually see the explosion before he'll choose to move. What he doesn't realize is that the fuze lights up with his first step off the fence, moving out in full expectation of an exploded bomb. In other words, he pesters Jesus for a sign, and while bombs are going off all around him, he says, "I didn't feel it, so it didn't happen." And, "If it didn't happen, I don't need to move."

Drat those dastardly fence riders.

Which leads, of course, to the introspection...
I wonder how often I sit on the fence myself, waiting for God to show me exactly what to do next? I pray, asking for clarity upon clarity, but fail to move, or do, or be - because I need God's exact Word. Which, naturally, translates into, I want risk-free certainty, and don't want to live by faith.