"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."