#Certainty

"It's not about whether or not someone is a bigot, but whether or not the argument which that someone is arguing is worth being a bigot about."

"The devil's happy when the critics run you off."

"I like the scientific spirit—the holding off, the being sure but not too sure, the willingness to surrender ideas when the evidence is against them: this is ultimately fine—it always keeps the way beyond open—always gives life, thought, affection, the whole man, a chance to try over again after a mistake—after a wrong guess."

"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."

"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."

"Ignorance more frequently begets confidence than does knowledge: it is those who know little, not those who know much, who so positively assert that this or that problem will never be solved by science."

"Hope is not the conviction that something will turn out well but the certainty that something makes sense, regardless of how it turns out."

"I always make sure that the world will prove me right. It gives me the freedom to contradict myself."

"Feeling lost, crazy and desperate belongs to a good life as much as optimism, certainty and reason."

"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."

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

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

"In our reasonings concerning matter of fact, there are all imaginable degrees of assurance, from the highest certainty to the lowest species of moral evidence. A wise man, therefore, proportions his belief to the evidence."

"When your only regret is if anyone thinks you regret anything - that is the definition of conviction."

"We often call a certainty a hope, to bring it luck."

"If in other sciences we should arrive at certainty without doubt and truth without error, it behooves us to place the foundations of knowledge in mathematics."

"Doubter wants proof which contributes nothing to her faith."

"Peaceful disputes are maintained when men sincerely believe that they are morally, logically correct about the issues at hand. It is when neither side is really certain that wars are instigated."

"There is no such uncertainty as a sure thing."