I found this fraying poster today among some
notes I hadn't looked at for a long time. It was
pinned to my day job office bulletin board for many years.
I've seen versions of the quote many times since,
but I like this translation
more than any other I've seen.

"Until one is committed there is hesitancy,
the chance to drawback, 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,
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 favour
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, begin it.
Boldness has genius, power and magic in it.

Begin It Now."

-Goethe-