Anything that won't sell, I don't want to invent. Its sale…

This is a proof of a well-trained mind, to rejoice in what is good and to grieve at the opposite.

— Marcus Tullius Cicero

Treason implies responsibility for something, control over something, influence upon something, knowledge of something. Treason in our time is a proof of genius. Why,…

— Antoine de Saint-Exupery

No sadder proof can be given by a man of his own littleness than disbelief in great men.

— Thomas Carlyle

And I like a good horror story as much as the next person so long as they kill off some men too and not…

— Meg Cabot

With a full century of contrary proof in our possession and despite our demonstrated capacity for cooperative teamwork, some among us seem to accept…

— Dwight D. Eisenhower

Proof is an idol before which the mathematician tortures himself.

— Arthur Eddington

The idea of photography as evidence is pure bullshit. A photo is no more proof of any reality than what you may hear being…

— Marc Riboud

Religious freedom is too sacred a right to be restricted or prohibited in any degree without convincing proof that a legitimate interest of the…

— Frank Murphy

...it is a very risky thing for anyone to go about proclaiming the truth simply because he finds himself in possession of concrete documentary…

— Jorge Amado

Knowledge forbidden? Suspicious, reasonless. Why should their Lord Envy them that? Can it be sin to know, Can it be death? And do they…

— John Milton

The proof that a philosopher does not know what he is talking about is apt to sadden his followers before it reacts on himself.

— Henry Adams

Wisdom is not finally tested in the schools, Wisdom cannot be pass'd from one having it to another not having it, Wisdom is of…

— Walt Whitman

Martyrdom has always been a proof of the intensity, never of the correctness of a belief.

— Arthur Schnitzler

My father? A hard drinking man from the 70's. We actually have no pictures of my dad where he is not holding a beer.…

— Christopher Titus

Indifference to one's own faith is no proof of tolerance. Loyalty to one's own is part of a larger loyalty to faith generally.

— Abba Hillel Silver