evidence: Searching the web, and I haven't been able to find anywhere he actually said it. Only things I find is the adidas ad. Looking at the words "Impossible is nothing" through books it only appeared after 2004. [...] Looking at wikiquotes and the impossible quote is not listed there. When looking at the web, it's probably the most famous quote "by him", so it's very surprising it's not listed by wikiquotes, if he actually said it. [...] Impossible is not a fact. It’s an opinion. Impossible is not a declaration. It’s a dare. Impossible is potential.