“What I don't like today is, to put it coarsely, the phony Hasidism, the phony mysticism. Many students say, "Teach me mysticism."”

Source: Anne Sexton: A Self-Portrait in Letters

Notes from Devotional Authors of the Middle Ages (1873-1874)
Context: Where shall I find God? In myself. That is the true Mystical Doctrine. But then I myself must be in a state for Him to come and dwell in me. This is the whole aim of the Mystical Life; and all Mystical Rules in all times and countries have been laid down for putting the soul into such a state.
That the soul herself should be heaven, that our Father which is in heaven should dwell in her, that there is something within us infinitely more estimable than often comes out, that God enlarges this "palace of our soul" by degrees so as to enable her to receive Himself, that thus he gives her liberty but that the soul must give herself up absolutely to Him for Him to do this, the incalculable benefit of this occasional but frequent intercourse with the Perfect: this is the conclusion and sum of the whole matter, put into beautiful language by the Mystics. And of this process they describe the steps, and assign periods of months and years during which the steps, they say, are commonly made by those who make them at all.

6.522
Original German: Es gibt allerdings Unaussprechliches. Dies zeigt sich, es ist das Mystische.
1920s, Tractatus Logico-Philosophicus (1922)

1960s, Playboy Interview (1969)

And Rumi, the great poet and teacher of Sufism, declares: "Past and future veil God from our sight; burn up both of them with fire."
The Power of Now (1997)

"Giordano Bruno", p. 95
Everything Is Under Control (1998)
Context: Most historians merely mention that Bruno was charged with the heresy of teaching Copernican astronomy, but Frances Yates, a historian who specialized in the occult aspects of the scientific revolution, points out that Bruno was charged with 18 heresies and crimes, including the practice of sorcery and organizing secret societies to oppose the Vatican. Yates thinks Bruno may have had a role in the invention of either Rosicrucianism or Freemasonry or both.
Bruno's teachings combined the new science of his time with traditional Cabalistic mysticism. He believed in a universe of infinite space with infinite planets, and in a kind of dualistic pantheism, in which the divine is incarnate in every part but always in conflicting forms that both oppose and support each other. Whatever his link with occult secret societies, he influenced Hegel, Marx, theosophy, James Joyce, Timothy Leary, Discordianism, and Dr. Wilhelm Reich.

Interview with GLAAD, April 27, 2016. http://www.glaad.org/blog/interview-abby-stein-talks-about-being-transgender-woman-hasidic-jewish-community
2016

Max Weber, , 1916.
Context: Mysticism intends a state of "possession," not action, and the individual is not a tool but a "vessel" of the divine. Action in the world must thus appear as endangering the absolutely irrational and other-worldly religious state. Active asceticism operates within the world; rationally active asceticism, in mastering the world, seeks to tame what is creatural and wicked through work in a worldly "vocation" (inner-worldly asceticism). Such asceticism contrasts radically with mysticism, if the latter draws the full conclusion of fleeing from the world (contemplative flight from the world). The contrast is tempered, however, if active asceticism confines itself to keeping down and to overcoming creatural wickedness in the actor's own nature. For then it enhances the concentration on the firmly established God-willed and active redemptory accomplishments to the point of avoiding any action in the orders of the world (asceticist flight from the world). Thereby active asceticism in external bearing comes close to contemplative flight from the world. The contrast between asceticism and mysticism is also tempered if the contemplative mystic does not draw the conclusion that he should flee from the world, but, like the inner-worldly asceticist, remain in the orders of the world (inner-worldly mysticism).
In both cases the contrast can actually disappear in practice and some combination of both forms of the quest for salvation may occur. But the contrast may continue to exist even under the veil of external similarity. For the true mystic the principle continues to hold: the creature must be silent so that God may speak.

Source: The Long Tomorrow (1955), Chapter 30