The essence of our experience is change. Change is incessant. Moment by moment life flows by and it is never the same. Perpetual alteration is the essence of the perceptual universe. A thought springs up in your head and half a second later, it is gone. In comes another one, and that is gone too. A sound strikes your ears and then silence. Open your eyes and the world pours in, blink and it is gone. People come into your life and they leave again. Friends go, relatives die. Your fortunes go up and they go down. Sometimes you win and just as often you lose. It is incessant: change, change, change. No two moments ever the same.
There is not a thing wrong with this…It only sounds bleak when you view it from the level of ordinary mental perspective, the very level at which the treadmill mechanism operates. Down under that level lies another whole perspective, a completely different way to look at the universe. It is a level of functioning where the mind does not try to freeze time, where we do not grasp onto our experience as it flows by, where we do not try to block things out and ignore them.
Bhante Gunaratana, Mindfulness in Plain English