what is impossible?

The only way of finding the limits of the possible is by going beyond them into the impossible.-Arthur C. Clarke
I try not to think that there is a limit to greatness. I like this quote because it expresses the way I see things. I see it as; you are the only one that can limit yourself to doing what you want. like the adidas comercial, there slogan is " IMPOSSIBLE IS NOTHING". Time and time again we have proven to surpass the impossible....