He must learn not only to identify himself with the Void but to remain immovably fixed in such nihilistic identity. He must not only learn to regard everything as Mind but to remain unshakeably certain that it is so. When no doubt can penetrate this insight and no experience can dislodge him from this inner vacuum . . .
-- Notebooks Category 23: Advanced Contemplation > Chapter 8: The Void As Contemplative Experience > # 182