Stillness means to a timid stillness. Even just one instant, that's enough. Once you notice it is yours forever. The vedanta says we are none of these three bodies. We are not the physical body and were not the causal body. What destruction we have to be free. Up the movie. No matter what movie you play or do not play a movie, the screen is perfectly the same thing you,. which is being in consciousness is always the same reality. It does not matter. If suttle, co causal, subtle and physical bodies appear and disappear, you're none of it once you realize that you're no longer caught in a particular cause and subtle body