“Every mathematical problem must be solvable. We are convinced of that. After all, one of the greatest things about mathematics is its certainty.”— David Hilbert
“If you have two guys on a stage and one says, 'I have a solution,' and the other says, 'I'm not so sure,' the guy who says, 'I'm not so sure' will always lose.”— Roger Ailes
“If a man will begin with certainties, he shall end in doubts; but if he will be content to begin with doubts, he shall end in certainties.”— Francis Bacon
“A perfect acquaintance with all the circumstances affecting the occurrence of an event would change expectation into certainty, and leave no room for a theory of probabilities.”— George Boole
“Fundamentalism is the failure of nerve, the retreat into certainty in the face of complexity.”— William D. Tammeus