If you feel joy you have already become identified; witnessing is gone. If you feel sad you are no more a witness; you have forgotten witnessing, you have become involved. You are colored by your psychology of the moment. Joy, sadness, all these qualities, are part of your psychology. And witnessing is a transcendence; it is not psychological. The whole art of meditation consists in witnessing. Then what does it bring? At the most we can say it brings total peace; it simply brings eternal silence. You cannot define it as joy. The moment you define it as joy you have fallen into the world of duality again. Then you have become part of what is passing, you have started clinging to it.