Some pain is there in your body. Do one thing: forget the whole body, just concentrate on the part of the body which is painful. And then a strange thing will be noted. When you concentrate on the part of the body which is painful, you see that part is shrinking. First you feel that the pain, the ache, is in your whole leg. When you concentrate, then you feel it is not in the whole leg. It was exaggerated - it is just at the knee.
Concentrate more, and you will feel it is not on the whole knee but just on a pinpoint. Concentrate more on the pinpoint; forget the whole body. Just close your eyes and go on concentrating in order to find where the pain is. It will go on shrinking; the area will become smaller and smaller. Then a moment will come when it will be just a pinpoint. Go on staring at the pinpoint, and suddenly the pinpoint will disappear and you will be filled with bliss. Instead of pain you will be filled with bliss.