“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
“The certainty of the conclusions is given by the sole fact that the axiomatic method is used.”— Gérard Debreu
“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
“I tore myself away from the safe comfort of certainties through my love for the truth; and truth rewarded me.”— Simone de Beauvoir
“The very desire for guarantees that our values are eternal and secure in some objective heaven is perhaps only a craving for the certainties of childhood or the absolute values of our primitive past.”— Isaiah Berlin