Just as the spiritual ignorance of man reveals itself during his slumbers by his total lack of knowledge that the dream-experience is only a series of ideas, so the evil character of man reveals itself during his slumbers by the rule it imposes--unrepressed by legal sanctions or social codes--upon his dreams. This is one of the elements of truth in Freud's otherwise grossly materialistic teaching. The dream is partially a self-revelation. Hence it is the teaching of the mystical order of Turkish Sufis that the progress of a disciple is partially to be measured by his teacher by the progressive purification attained in the character of his dream life.
-- Notebooks Category 19: The Reign of Relativity > Chapter 3: The States of Consciousness > # 61
-- Perspectives > Chapter 19: The Reign of Relativity > # 15