That the moment one definitely commits oneself, then providence moves too. All sorts of things occur to help one that would not have otherwise 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 would have dreamed would come his way.
Why it works, how it works- we are not really sure, but it works. Just like when you declare you are looking for computer, suddenly you see all these opportunities, the same with commitments. When we commit, things begin to happen. We begin to identify external resources as well as internal resources. Things that we didn't see before. Because my question becomes "how can I succeed". And then children on the bus or the time on the clock suddenly become visible to us.