"That would be the ultimate proof of your ability, wouldn't it?"

That they were not was sure proof of mankind's ability to believe two mutually exclusive things at the same time.

And what a proof of Drek's ability to protect them.

Instead, he took an instinctive course that was proof of his ability as an ugly fighter.

"The expansion is physical proof of our ability to survive."

And when necessary, he has given proof of his ability to defend himself.

Which was, he supposed, irrefutable proof of her ability to cast a spell.

He wanted it there to look at, to keep panic away, visible proof of his ability to defend himself.

It will stand as proof of my ability to kidnap and return people at will.

The Test was the final proof of a mage's ability to cope with the power.