There is an example of character becoming destiny - imagine two boats. They are maybe in a race or setting out from the same port, and they look like they are going in the same direction. But they are a couple degrees off, and over time the boats start to get further and further away until they are out of sight. After enough time the two boats will end up in very different places.

That is what this is about - the small changes that you make in your thoughts, words and habits will make huge differences in your character and your destiny.