“Once you make a decision, the universe conspires to make it happen.”
Attributed to Emerson in The Gift of Depression : Twenty-one Inspirational Stories Sharing Experience, Strength, and Hope (2001) by John F. Brown, p. 56, no prior occurrence of this a statement has been located; it seems to be derived from one which occurs in The Alchemist (1988) by Paulo Coelho, p. 22: When you want something, all the universe conspires in helping you to achieve it.
Misattributed
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Ralph Waldo Emerson 727
American philosopher, essayist, and poet 1803–1882Related quotes

“Making decisions when you can vs. when you have to makes for better decisions.”
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Multiple variations of this quote can be found, but the earliest one on Google Books which uses the phrase "friendly or hostile" and attributes it to Einstein is The Complete Idiot's Guide to Spiritual Healing by Susan Gregg (2000), p. 5 http://books.google.com/books?id=XLQ8X67PozAC&lpg=PP1&pg=PA5#v=onepage&q&f=false, and this book gives no source for the quote.
A variant is found in Irving Oyle's The New American Medicine Show (1979) on p. 163, where Oyle writes: 'There is a story about Albert Einstein's view of human existence. Asked to pose the most vital question facing humanity, he replied, "Is the universe friendly?"' This variant is repeated in a number of books from the 1980s and 90s, so it probably pre-dates the "friendly or hostile" version. And the idea that the most important question we can ask is "Is the universe friendly?" dates back much earlier than the attribution to Einstein, for example in Emil Carl Wilm's 1912 book The Problem of Religion he includes the following footnote on p. 114 http://books.google.com/books?id=nWYiAAAAYAAJ&pg=PA114#v=onepage&q&f=false: 'A friend proposed to the late F. W. H. Myers the following question: "What is the thing which above all others you would like to know? If you could ask the Sphinx one question, and only one, what would the question be?" After a moment's silence Myers replied: "I think it would be this: Is the universe friendly?"'
Misattributed

“When you want something, all the universe conspires in helping you to achieve it.”
E quando você quer alguma coisa, todo o Universo conspira para que você realize seu desejo.
Variant: And, when you want something, all the universe conspires in helping you to achieve it.
Source: The Alchemist (1988), p. 22; a variant of this has become attributed to Ralph Waldo Emerson: "Once you make a decision, the universe conspires to make it happen" — but no occurrence of this a statement has been located prior to in The Gift of Depression : Twenty-one Inspirational Stories Sharing Experience, Strength, and Hope (2001) by John F. Brown, p. 56

Lexie Darnell, Chapter 16, p. 196
2000s, At First Sight (2005)

“The Universe doesn't like secrets. It conspires to reveal the truth, to lead you to it.”
Source: Beautiful Lies