Silas Thorne's Journal

W. H. Murray in The Scottish Himalaya Expedition, 1951:

...Until one is committed, there is hesitancy, the chance to draw back, always ineffectiveness. 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, the providence moves too. A whole stream of events issues from the decision, raising in one's favor all manner of unforeseen incidents, meetings and material assistance, which no man could have dreamt would have come his way...

It seems that this quote was falsely attributed to Goethe (See http://www.goethesociety.org/pages/quotescom.html for more.), but it doesn't really matter. I believe it works and I've seen it happen.

And now the world can see it as a wondrous piece of Scottish wisdom.