Anything that won't sell, I don't want to invent. Its sale is proof of utility, and utility is success.
Thomas A. Edison
My life is proof that I don't need you to do what I do. If there's no one to see it, I'll watch it.
Abel Ferrara
Being-alone is a deficient mode of being-with; its possibility is a proof for the latter.
Martin Heidegger
Is it unreasonable to have proof of citizenship when entering another country?
Gwen Ifill
Anybody can be Pope; the proof of this is that I have become one.
Pope John XXIII
I'm proof that, even after having a baby, you can look better and sexier than ever!
Kourtney Kardashian
A proof tells us where to concentrate our doubts.
Morris Kline
We must never assume that which is incapable of proof.
George Henry Lewes
We need proof in our society.
Shirley MacLaine
Here's proof that if you live long enough, anything is possible.
Barry Manilow