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The mystic who overbalances himself with ephemeral ecstasies pays for them by deep moods of depression. This is worth noting, but it is not all. If there is not a rationally thought-out metaphysical foundation to give constant and steady support to his intuitions of truth, he may find these intuitions telling him one thing this year and the opposite next year. But this foundation must be a scientific and not merely a speculative metaphysics, which means that it must itself be irrefragable, gathering its facts not with the critical intellect alone, but also with the spontaneous intuition and above all with the insight. Such a system exists only in the metaphysics of truth.
-- Notebooks Category 16: The Sensitives > Chapter 2 : Phases of Mystical Development > # 152
-- Perspectives > Chapter 16: The Sensitives > # 41