The following is taken from thoughts by Thich Nhat Hanh, found in The Moment is Perfect.
Many of us don’t allow ourselves to be relaxed. Why do we always try to run and run, even while having our breakfast, while having our lunch, while walking, while sitting? There’s something pushing and pulling us all the time. We make ourselves busy in the hopes of having happiness in the future.
In the sutra we find the following: "Don’t get caught in the past, because the past is gone. Don’t get upset about the future, because the future is not yet here. There is only one moment for you to be alive, and that is the present moment. Go back to the present moment and live this moment deeply, and you’ll be free."