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According to Lang and Thalbourne, "the intensity of mystical experiences forms a progression that starts with quite general experiences of happiness, followed by enlightenment by a higher power, and ultimately leading to union with the Absolute." 
"...the intensity can range from a few moments of rapture to several hours of shattering psychological experience." 
Types of experience, from least to most intensive, Insights/intuitive glimmers, Peak Experience, Mystical Glimpse, Mystical Visions, Revelations, transcendent experiences, permanent unions.
Einstein nodded: he was a good listener. After a pause he said, "The cosmic man must be restored, the whole man who is made in the image and likeness of the arch-force, which you may call God. This man thinks with his heart and not with party dogma. As I've explained before, there is an order in the universe – a cosmic order – and humans have the possibility of understanding these laws." Einstein leaned back in his chair; so did I,putting my writing pad on my knees. He added, "I have no doubt that the allies will win the war." I smiled, "Oh, you are my prophet again." Prophet or not," he scratched his head, "what I say is more often felt through intuition than thought through intellect. (Hermanns, 1930).
- Lange, Rense, and Michael A. Thalbourne. "The Rasch Scaling of Mystical Experiences: Construct Validity and Correlates of the Mystical Experience Scale (Mes)." The International Journal for the Psychology of Religion 17 2 (2007): 130.
- Allman, Lorraine S., Olivia de la Rocha, David N. Elkins, and Robert S. Weathers. “Psychotherapists’ Attitudes toward Clients Reporting Mystical Experiences.” Psychotherapy: Theory, Research, Practice, Training 29, no. 4 (Win 1992): 565.