Until one is committed, there is hesitancy

“Until one is committed, there is hesitancy, the chance to draw back. Concerning all acts of initiative (and creation), there is one elementary truth, the ignorance of which kills countless ideas and splendid plans: that the moment one definitely commits oneself, then Providence moves too. All sorts of things occur to help one that would never otherwise have occurred. A whole stream of events issues from the decision, raising in one‟s favor all manner of unforeseen incidents and meetings and material assistance, which no man could have dreamed would have come his way. Whatever you can do, or dream you can do, begin it. Boldness has genius, power, and magic in it. Begin it now.” – William H Murray 

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This is often mistakenly attributed to Goethe when it really just came from a Goethe couplet and is presumed to have been said in full my Scottish Mountaineer, W H Murray, although that is not 100% certain. Is there are greater quote on the importance of commitment? 

I doubt it.