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  5. ...it is well known that a vital ingredient of success is...

...it is well known that a vital ingredient of success is not knowing that what you're attempting can't be done.

Terry Pratchett
Knowing, Done, Ingredients
FaceBook post by Terry Pratchett from Nov 23, 2016
...it is well known that a vital ingredient of success is not knowing that what you're attempting can't be done.