"What do I have to say about advanced meditation? It's a feeling. It's beyond the body and beyond the mind. I would classify beginning meditation -- beginning, intermediate, whatever you'd like to call it -- as meditation with thought. As long as there is thought in the mind while you're sitting, practicing zazen, then you're in an early stage of meditation from my point of view. When you're sitting and there's no thought at all -- no thought, no image, no idea, no feeling, no sense of self or non-self, no sense of thought or no-thought -- now you have entered into the realm of advanced meditation." Rama - Dr. Frederick Lenz
Advanced Meditation Practices is talk 15 of 18 in the Zen Tapes series.