The attention must be concentrated at this stage solely on the hidden soul. No other aim and even no symbol of It may now be held. When he has become so profoundly absorbed in this contemplation that his whole being, his whole psyche of thought, feeling, will, and intuition are mingled and blent in it, there may come suddenly and unexpectedly a displacement of awareness. He actually passes out of what he has hitherto known as himself into a new dimension and becomes a different being. When first experienced and unknown, there is the fear that this is death itself. It is indeed what is termed in mystical traditions of the West as "dying to oneself" and of the East as "passing away from oneself." But when one has repeated periodically and grown familiar with this experience, there is not only no fear but the experience is eagerly sought and welcomed. There I dissolved myself in the lake of the Water of Life.
-- Notebooks Category 23: Advanced Contemplation > Chapter 7: Contemplative Stillness > # 321
-- Perspectives > Chapter 24: The Peace within You > # 58