When we use a pool cue, the cue, the cue ball, and the target are one. They are not many things or different things but one thing. They are all dependent upon one another. Without the cue, there is nothing to shoot the cue ball. Without the cue ball, there is nothing for the pool cue to strike. Without the target, the cue and the cue ball have nothing to aim at. All these things work together to make something happen. All the billions of things of the Tao are one, all working together, in harmony.
