“We ought to regard the present state of the universe as the effect of its antecedent state and as the cause of the state that is to follow. An intelligence knowing all the forces acting in nature at a given instant, as well as the momentary positions of all things in the universe, would be able to comprehend in one single formula the motions of the largest bodies as well as the lightest atoms in the world, provided that its intellect were sufficiently powerful to subject all data to analysis; to it nothing would be uncertain, the future as well as the past would be present to its eyes. The perfection that the human mind has been able to give to astronomy affords but a feeble outline of such an intelligence.”

“From the house of unbeliefto true religionis a single breath;From the world of doubtto certaintyis a single breath;Enjoy this precious single breath,for the harvestof our whole livesis that same one breath.”

“There is no certainity like faith.”

“Anyone claiming certainty about life, truth, creation, or purpose of the Universe, is either ignorant or unfit to comprehend the implications of the presented dilemmas.”

“The South African artist William Kentridge speaks to this type of certainty: ‘To say that one needs art, or politics, that incorporate ambiguity and contradiction is not to say that one then stops recognizing and condemning things as evil. However, it might stop one being so utterly convinced of the certainty of one’s own solutions. There needs to be a strong understanding of fallibility and how the very act of certainty or authoritativeness can bring disasters.’The outcome of the current crisis is already determined.”

“Doubter wants proof which contributes nothing to her faith.”

“It has always been asked in the spirit of: ‘What are the best sources of our knowledge – the most reliable ones, those which will not lead us into error, and those to which we can and must turn, in case of doubt, as the last court of appeal?’ I propose to assume, instead, that no such ideal sources exist – no more than ideal rulers – and that all ‘sources’ are liable to lead us into errors at times. And I propose to replace, therefore, the question of the sources of our knowledge by the entirely different question: ‘How can we hope to detect and eliminate error?’ The question of the sources of our knowledge, like so many authoritarian questions, is a genetic one. It asks for the origin of our knowledge, in the belief that knowledge may legitimize itself by its pedigree. The nobility of the racially pure knowledge, the untainted knowledge, the knowledge which derives from the highest authority, if possible from God: these are the (often unconscious) metaphysical ideas behind the question. My modified question, ‘How can we hope to detect error?’ may be said to derive from the view that such pure, untainted and certain sources do not exist, and that questions of origin or of purity should not be confounded with questions of validity, or of truth. …. The proper answer to my question ‘How can we hope to detect and eliminate error?’ is I believe, ‘By criticizing the theories or guesses of others and – if we can train ourselves to do so – by criticizing our own theories or guesses.’ …. So my answer to the questions ‘How do you know? What is the source or the basis of your assertion? What observations have led you to it?’ would be: ‘I do not know: my assertion was merely a guess. Never mind the source, or the sources, from which it may spring – there are many possible sources, and I may not be aware of half of them; and origins or pedigrees have in any case little bearing upon truth. But if you are interested in the problem which I tried to solve by my tentative assertion, you may help me by criticizing it as severely as you can; and if you can design some experimental test which you think might refute my assertion, I shall gladly, and to the best of my powers, help you to refute it.”

“Certainty is the most vivid condition of ignorance and the most necessarycondition for knowledge.”

“He who asserts belief with absolute certainty knows nothing of faith and makes himself into a fool. He who is wise, upon realizing they have done this, recants and searches themselves for further enlightenment.”

“I believe that we do not know anything for certain, but everything probably.”

“My peak? Would I even have one? I hardly had had anything you could call a life. A few ripples. some rises and falls. But that’s it. Almost nothing. Nothing born of nothing. I’d loved and been loved, but I had nothing to show. It was a singularly plain, featureless landscape. I felt like I was in a video game. A surrogate Pacman, crunching blindly through a labyrinth of dotted lines. The only certainty was my death.”

“You’ve got to be sure of yourself beforeYou can ever win a prize.”

“When your only regret is if anyone thinks you regret anything – that is the definition of conviction.”

“If you do not know where you come from, then you don’t know where you are, and if you don’t know where you are, then you don’t know where you’re going. And if you don’t know where you’re going, you’re probably going wrong.”

“To learn which questions are unanswerable, and not to answer them: this skill is most needful in times of stress and darkness.”