If they discover the mentalist truth that this existence is like a dream, will not men's practical existence in the world become imperilled? Those who are already unbalanced will become more so. Those who are rigidly fixed in materialistic attitudes will become uncertain and unsettled. But those who come to it previously prepared by their intellectual and emotional history will be able to use their worldly life responsibly but without being mastered by it.
-- Notebooks Category 21: Mentalism > Chapter 3: The Individual and World Mind > # 47