Today annihilates yesterday. The person who went to sleep last night no longer exists. But we to cling to the idea that we have a personal history, a past, and this this is our identity. We can only ever be what we are in the moment. When we cross a stream the water rushes past underneath us, when we cross that stream again, its not the same stream, its not the same water, that has long gone down stream on its journey to the sea.