There is no need to yield to the fear of the void, which comes in the deepest meditation. That is merely the personal ego offering its resistance to the higher self. That same fear of never being able to come back has to be faced by all advanced mystics when they reach this stage of meditation, but it is utterly groundless and is really a test of faith in God to protect them in a most laudable endeavour: to come closer to him and to advance farther from their lower self. Having once yielded to the fear and failed to make the necessary advance, the aspirant has failed in the test and it may be a long time before a similar opportunity will present itself again, if at all. Nevertheless, the memory of that great experience should always be an inspiration toward a more impersonal life.
-- Notebooks Category 23: Advanced Contemplation > Chapter 8: The Void As Contemplative Experience > # 62