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We absolutely must leave room for doubt or there is no progress and no learning. There is no learning without having to pose a question. And a question requires doubt. People search for certainty. But there is no certainty. People are terrified — how can you live and not know? It is not odd at all. You only think you know, as a matter of fact. And most of your actions are based on incomplete knowledge and you really don't know what it is all about, or what the purpose of the world is, or know a great deal of other things. It is possible to live and not know.
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From lecture "What is and What Should be the Role of Scientific Culture in Modern Society", given at the Galileo Symposium in Italy, 1964.

 

Richard Feynman

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The scientist has a lot of experience with ignorance and doubt and uncertainty, and this experience is of very great importance, I think. When a scientist doesn’t know the answer to a problem, he is ignorant. When he has a hunch as to what the result is, he is uncertain. And when he is pretty damn sure of what the result is going to be, he is still in some doubt. We have found it of paramount importance that in order to progress, we must recognize our ignorance and leave room for doubt. Scientific knowledge is a body of statements of varying degrees of certainty — some most unsure, some nearly sure, but none absolutely certain. Now, we scientists are used to this, and we take it for granted that it is perfectly consistent to be unsure, that it is possible to live and not know. But I don’t know whether everyone realizes this is true. Our freedom to doubt was born out of a struggle against authority in the early days of science. It was a very deep and strong struggle: permit us to question — to doubt — to not be sure. I think that it is important that we do not forget this struggle and thus perhaps lose what we have gained.

 

Richard Feynman

 

I can live with doubt, and uncertainty, and not knowing. I think it's much more interesting to live not knowing than to have answers which might be wrong. I have approximate answers, and possible beliefs, and different degrees of certainty about different things, but I’m not absolutely sure of anything, and in many things I don’t know anything about, such as whether it means anything to ask why we’re here, and what the question might mean. I might think about a little, but if I can’t figure it out, then I go to something else. But I don’t have to know an answer. I don’t feel frightened by not knowing things, by being lost in a mysterious universe without having any purpose, which is the way it really is, as far as I can tell, possibly. It doesn’t frighten me.

 

Richard Feynman

 

During the late sixties I had a chance to give a dozen addresses to people who were concerned with education and schooling. I asked myself, since when are people born needy? In need, for instance, of education? Since when do we have to learn the language we speak by being taught by somebody? I wanted to find out where the idea came from that all over the world people have to be assembled in specific groups of not less than fifteen, otherwise it's not a class, not more than forty, otherwise they are underprivileged, for yearly, not less than 800 hours, otherwise they don't get enough, not more than 1,100 hours, otherwise it's considered a prison, for four-year periods by somebody else who has undergone this for a longer time. How did it come about that such a crazy process like schooling would become necessary? Then I realized that it was something like engineering people, that our society doesn't only produce artifact things, but artifact people. And that it doesn't do that by the content of the curriculum, but by getting them through this ritual which makes them believe that learning happens as a result of being taught; that learning can be divided into separate tasks; that learning can be measured and pieces can be added one to the other; that learning provides value for the objects which then sell in the market.
And it's true. The more expensive the schooling of a person, the more money he will make in the course of his life. This in spite of the certainty, from a social science point of view, that there's absolutely no relationship between the curriculum content and what people actually do satisfactorily for themselves or society in life.

 

Ivan Illich

 

A humble knowledge of oneself is a surer road to God than a deep searching of the sciences. Yet learning itself is not to be blamed, or is the simple knowledge of anything whatsoever to be despised, for true learning is good in itself and ordained by God; but a good conscience and a holy life are always to be preferred. But because many are more eager to acquire much learning than to live well, they often go astray, and bear little or no fruit. If only such people were as diligent in the uprooting of vices and the panting of virtues as they are in the debating of problems, there would not be so many evils and scandals among the people, nor such laxity in communities. At the Day of Judgement, we shall not be asked what we have read, but what we have done; not how eloquently we have spoken, but how holily we have lived. Tell me, where are now all those Masters and Doctors whom you knew so well in their lifetime in the full flower of their learning? Other men now sit in their seats, and they are hardly ever called to mind. In their lifetime they seemed of great account, but now no one speaks of them

 

Thomas a Kempis

 

Politics have always covered two distinct kinds of problems: problems of administrative routine, and those that may be called 'questions of the moment.'... A question of the moment is, indeed, a substitute for some notion, such as the idea of God, or hereditary monarchy, or national glory, that has hitherto acted as a symbol of human co-ordination. It provides no new positive certainty to replace the discredited certainty, but is what the name implies: the raising of a question which the old certainty no longer answers.

 

Laura Riding