Impossible is just a big word thrown around by small men who find it easier to live in the world they've been given than to explore the power they have to change it.
Impossible is not a fact. It's an opinion. Impossible is not a declaration. It's a dare. Impossible is potential. Impossible is temporary.
Impossible is nothing.
― Muhammad Ali
One of my favourite quotes. I think I'm slightly obsessed with the concept of impossible. Other good quote by Douglas Adams on the concept here.