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Lies propagate, that’s what I’m saying. You’ve got to tell more lies to cover them up, lie about every fact that’s connected to the first lie. And if you kept on lying, and you kept on trying to cover it up, sooner or later you’d even have to start lying about the general laws of thought. Like, someone is selling you some kind of alternative medicine that doesn’t work, and any double-blind experimental study will confirm that it doesn’t work. So if someone wants to go on defending the lie, they’ve got to get you to disbelieve in the experimental method. Like, the experimental method is just for merely scientific kinds of medicine, not amazing alternative medicine like theirs. Or a good and virtuous person should believe as strongly as they can, no matter what the evidence says. Or truth doesn’t exist and there’s no such thing as objective reality. A lot of common wisdom like that isn’t just mistaken, it’s anti-epistemology, it’s systematically wrong. Every rule of rationality that tells you how to find the truth, there’s someone out there who needs you to believe the opposite. If you once tell a lie, the truth is ever after your enemy; and there’s a lot of people out there telling lies.
--
Harry Potter in Ch. 65

 

Eliezer Yudkowsky

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If any remedy is tested under controlled scientific conditions and proved to be effective, it will cease to be alternative and will simply become medicine. So-called alternative medicine either hasn’t been tested or it has failed its tests.

 

Richard Dawkins

 

Lying, as we all know, does not take place only in war-time. Man, it has been said, is not "a veridical animal," but his habit of lying is not nearly so extraordinary as his amazing readiness to believe. It is, indeed, because of human credulity that lies flourish. But in war-time the authoritative organization of lying is not sufficiently recognized. The deception of whole peoples is not a matter which can be lightly regarded.
A useful purpose can therefore be served in the interval of so-called peace by a warning which people can examine with dispassionate calm, that the authorities in each country do, and indeed must, resort to this practice in order, first, to justify themselves by depicting the enemy as an undiluted criminal; and secondly, to inflame popular passion sufficiently to secure recruits for the continuance of the struggle. They cannot afford to tell the truth. In some cases it must be admitted that at the moment they do not know what the truth is.

 

Arthur Ponsonby

 

'The truth about the world about us.' 'Truth' is a word used in many different ways - 'You’re not telling the truth.' 'The truth about conditions in Russia.' 'Beauty is truth, truth beauty.' I want to use it here in the sense of what lies behind and outward show. I.et me hasten to explain by giving an example. The sun rises in the east and sets in the west. That is what we see; that is the ‘outward show'. In the past the outward show was regarded as the truth. But then a scientist came along to question it and then to announce that the truth was quite different from the appearance: the truth was that the earth revolved and the sun remained still -the outward show was telling a lie. The curious thing about scientific truths like this is that they often seem so useless. It makes no difference to the average man whether the sun moves or the earth moves. He still has to rise at dawn and stop work at dusk. But because a thing is useless it does not mean that it is valueless. Scientists still think it worthwhile to pursue truth. They do not expect that laws of gravitation and relativity are going to make much difference to everyday life, but they think it is a valuable activity to ask their eternal questions about the universe. And so we say that truth - the thing they are looking for—is a value.

 

Anthony Burgess

 

There is an ancient Chinese saying "He who labours with his mind rules over he who labours with his hand". This kind of backward idea is very harmful to youngsters from developing countries. Partly because of this type of concept, many students from these countries are inclined towards theoretical studies and avoid experimental work.

In reality, a theory in natural science cannot be without experimental foundations; physics, in particular, comes from experimental work.

 

Samuel C. C. Ting

 

Thus we see that the child is almost led to tell lies — or what seem to us lies from our point of view — by the very structure of his spontaneous thought. Given this situation, what will be the result of the laws laid down by adults about truthfulness? On the occasion of the first very obvious lies, or of those connected with some offense or other and told therefore with the object of averting punishment or scolding, the parents point out to the child that he has just done something very wrong and thus inculcate in him the respect for truth.

 

Jean Piaget