Much of the writing of Plotinus is descriptive of the state Hindus call Nirvikalpa Samadhi. It is the total dispersal of the world from the field of awareness, a complete flight from sensations, thoughts, mental images, the physical body, and, above all, from any and every kind of activity. To an outside observer, it may seem to be a trance state, but he would not be correct in his observation, nor altogether wrong. It is as deep as contemplation can possibly go. It is Consciousness freed from any kind of personal admixture, staying only with itself. All these other things being removed, what is left is then true self-knowledge, even if it is unconscious to the ego.
-- Notebooks Category 23: Advanced Contemplation > Chapter 8: The Void As Contemplative Experience > # 75