Most of the things worth doing in the world had been declared impossible before they were done.

The task was impossible, and mortal human beings accomplished nothing but their own destruction when they attempted the impossible.

Only the impossible is worth attempting. In everything else one is sure to fail.

The only impossible thing is something to be impossible.

Only the impossible is worth the effort.

The impossible is the least that one can demand.

Every noble work is at first impossible.

The way to deal with an impossible task was to chop it down into a number of merely very difficult tasks, and break each one of them into a group of horribly hard tasks, and each of them into tricky jobs, and each of them...

THE IMPOSSIBLE IS THE ONLY WORTHY OPPONENT OF MAN.

There are many things that seem impossible only so long as one does not attempt them.

In France, only the impossible is admired.

Impossible is a word to be found only in the dictionary of fools.

I've got an impossible job on my hands," he told them, "and if I succeed at it, there's an inconceivable one to follow.

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.