“In all beginnings dwells a magic force”

Miscellaneous Quotes On the Subjects of Magic and Magicians
Source: Dogme et Rituel de la Haute Magi Part I: The Doctrine of Transcendental Magic By Eliphas Levi (Alphonse Louis Constant), Translated by A. E. Waite, England, Rider & Company, England, 1896, Introduction p. 11

As quoted in "Sun Ra : Stranger from Outer Space" by Mike Walsh at missionCreep http://missioncreep.com/mw/sunra.html

Source: The Magician's Elephant

Source: Introductory Lectures on Psychoanalysis

Une âme ... n'est pas faite pour habiter une chose ; quand elle y est contrainte, il n’est plus rien en elle qui ne souffre violence.
in The Simone Weil Reader, p. 155
Simone Weil : An Anthology (1986), The Iliad or The Poem of Force (1940-1941)

Source: Two Boys Kissing

Attributed to Goethe by popular British novelist Marie Corelli in her essay "The Spirit of Work" as published in The Queen's Christmas carol : an anthology of poems, stories, essays, drawings and music / by British authors, artists and composers in 1905 by The Daily Mail of London.
Attributed to Goethe by William Hutchinson Murray, in his book The Scottish Himalayan Expedition (1951), this has been shown to be a misattribution at "German Myth 12: The Famous 'Goethe' Quotation", Answer.com http://german.about.com/library/blgermyth12.htm and "Popular Quotes: Commitment", Goethe Society of North America http://www.goethesociety.org/pages/quotescom.html
Misattributed
Variant: Whatever you can do, or dream you can, begin it. Boldness has genius, power, and magic in it. Begin it now.

Source: Even Cowgirls Get the Blues

Widely circulated on the internet, but no actual text to tie it back to Eckhart, as of yet.
Ref: en.wikiquote.org - Meister Eckhart / Disputed