Rivers flow downhill. That's a fact. It's just the way water works. They start at the top of mountains winding there way down to the valleys and eventually emptying themselves into the ocean.

It is an actual sport to sit on an inflatable raft and let the current take you where it wills. And the current can be powerful and very rough. Once you're in it it can be almost impossible to get out. You are at the mercy of the current.

If you've ever seen whitewater rafters flying down the treacherous currents of powerful rivers you know what I mean. They are pretty much helpless. They can steer their raft, but there is not very much control and in the end they are going to be bashed up and beaten up by the time they get down river.

It's the perfect metaphor for the world.