Today is the only time we can possibly live. Let us not turn it into a physical and mental hell by aimless worry about the future. Let us also stop fretting over the blunders we made yesterday. Remember how a walking trip always seems shorter if we concentrate, not on the total distance to our destination, but just the distance to the next milepost. In the same way, we should concentrate on living within today. Then better tomorrows will inevitably follow.