There is no end to a circle. They just keep going and going. No matter what spot on a circle you are at, there will, in time, be a high point and a low point. The important, and difficult, thing to remember is that you will eventually be at both points. Life will always be a battle between high and low points, and no matter how low the point seems there will always be a way out. A way to get back to the high point. A way out of the fire and into the new life.
