“Faith is not a certainty. Faith is the courage to live with uncertainty.”

“The opposite of faith is not doubt, it’s certainty.”

“I replace melancholy by courage, doubt by certainty, despair by hope, malice by good, complaints by duty, scepticism by faith, sophisms by cool equanimity and pride by modesty.”

“Tolerance grows only when faith loses certainty; certainty is murderous.”

“To save the world requires faith and courage: faith in reason, and courage to proclaim what reason shows to be true.”

“It was in World War I that the age-old certainties were lost. Until then aristocrats and capitalists felt secure in their position, and even socialists felt certain in their faith. It was never to be so again. The Age of Uncertainty began.”

“I think that all artists, regardless of degree of talent, are a painful, paradoxical combination of certainty and uncertainty, of arrogance and humility, constantly in need of reassurance, and yet with a stubborn streak of faith in their own validity no matter what.”

“May we have the courage to face the eventual doom of our civilization as we have the courage to face the certainty of our personal doom. The simple faith in progress is not a conviction belonging to strength, but one belong to acquiescence and hence to weakness.”

“Faith engenders courage; and also requires it.”

“Faith is the courage to live your life as if everything that happens does so for your highest good and learning. Like it or not.”