Terry Pratchett's book Going Postal would seem to be the last place I would find inspiration for startup life. Yet it was there that I ran into this fantastic quote which I couldn't resist sharing -
Never promise to do the possible. Anyone could do the possible. You should promise to do the impossible, because sometimes the impossible is possible, if you could find the right way, and at least you could often extend the limits of the possible. And if you failed, well, it had been impossible.