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See now the power of truth; the same experiment which at first glance seemed to show one thing, when more carefully examined, assures us of the contrary.
--
Discourses and Mathematical Demonstrations Relating to Two New Sciences (1638); Discorsi e dimostrazioni matematiche, intorno ? due nuove scienze, as translated by Henry Crew and Alfonso de Salvio (1914)

 

Galileo Galilei

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'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

 

It was the tendency to infidelity he saw so rife that led him often to declare in the social circle his estimate of Christian truth. “I have examined carefully,” he said to a friend from his boyhood, “the evidence of the Christian religion; and, if I was sitting as a juror upon its authenticity, I should unhesitatingly give my verdict in its favor.” To another person, he observed, “I have studied it, and I can prove its truth as clearly as any proposition ever submitted to the mind of man.”

 

Alexander Hamilton

 

Each piece, or part, of the whole nature is always an approximation to the complete truth, or the complete truth so far as we know it. In fact, everything we know is only some kind of approximation, because we know that we do not know all the laws as yet. Therefore, things must be learned only to be unlearned again or, more likely, to be corrected.......The test of all knowledge is experiment. Experiment is the sole judge of scientific “truth”.

 

Richard Feynman

 

For where is the man that has incontestable evidence of the truth of all that he holds, or of the falsehood of all he condemns; or can say that he has examined to the bottom all his own, or other men's opinions? The necessity of believing without knowledge, nay often upon very slight grounds, in this fleeting state of action and blindness we are in, should make us more busy and careful to inform ourselves than constrain others. At least, those who have not thoroughly examined to the bottom all their own tenets, must confess they are unfit to prescribe to others; and are unreasonable in imposing that as truth on other men's belief, which they themselves have not searched into, nor weighed the arguments of probability, on which they should receive or reject it. Those who have fairly and truly examined, and are thereby got past doubt in all the doctrines they profess and govern themselves by, would have a juster pretence to require others to follow them: but these are so few in number, and find so little reason to be magisterial in their opinions, that nothing insolent and imperious is to be expected from them: and there is reason to think, that, if men were better instructed themselves, they would be less imposing on others.

 

John Locke

 

We must trust to nothing but facts: These are presented to us by Nature, and cannot deceive. We ought, in every instance, to submit our reasoning to the test of experiment, and never to search for truth but by the natural road of experiment and observation.

 

Antoine Lavoisier