The threshold of this inner being cannot be crossed without overcoming the fear that arises on reaching it. This is a fear of the unknown, the unfamiliar, the fantastic, and the illusory. The ego shrinks back from what is so strange to its past experience. It is afraid of losing itself in this emptiness that confronts it, and with that losing hold of the solid ground of physical life. Only by calling up all its inner courage and inner strength can these enemies be conquered.
-- Notebooks Category 23: Advanced Contemplation > Chapter 8: The Void As Contemplative Experience > # 49