A positive mind is like a powerful stream of water that is gathering volume and force from hundreds of tributaries all along its course. The further on it goes the greater its power, until when it reaches its goal, that power is simply immense. A negative mind, however, would be something like a stream, that the further it flows the more divisions it makes, until, when it reaches its goal, instead of being one powerful stream, it has become a hundred, small, weak, shallow streams.