We commonly think of ourselves as beings possessing phases or states, which we know as emotions, desires, moods, and so forth. At first sight it appears to consist each a single and independent strung together along something which is called the ego, like beads on a necklace. But reflection shows this conception to be consistent more to the fact when we admit one state changes and gives way to another, we overlook the fact that it changes shape even while it persists. We change without ceasing. In Truth, we ourselves are who endure not through change, but by change. Our own lives, as actually experienced, as reality which we are most directly assured to be. We consider the nature of the world around us.
Do we find it impossible to discover anything which passes through, but itself to something other than changes which occur to it? The Universe IS itself a stream of change. However, change is only constant if you choose it to be.