Quotes about evidence

“It is my personal belief that nothing can exceed light speed,” said Sy at last. “I will mistrust anyone, government or Immortal, man or woman, human or alien, who attempts to tell me otherwise without providing convincing evidence.”

Disproving a claim that something exists is often quite difficult, and this difficulty is often mistaken for evidence that the claim is true...Presented as I am periodically with these and other fantastical claims, I sometimes feel a little like a formally dressed teetotaler at a drunken orgy for reiterating that not being able to conclusively refute the claims does not constitute evidence for them.

I remember thinking of mathematics as a kind of omnipotent protector. You could prove things to people and they would have to believe you whether they liked you or not.

Even the clearest and most perfect circumstantial evidence is likely to be at fault, after all, and therefore ought to be received with great caution. Take the case of any pencil, sharpened by any woman: if you have witness, you will find she did it with a knife; but if you take simply the aspect of the pencil, you will say she did it with her teeth.

Let us hear the suspicions. I will look after the proofs.

It is a capital mistake to theorize before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts.

"Circumstantial evidence is a very tricky thing," answered Holmes thoughtfully. "It may seem to point very straight to one thing, but if you shift your own point of view a little, you may find it pointing in an equally uncompromising manner to something entirely different."

"Data! Data! Data!" he cried impatiently. "I can't make bricks without clay."

It is a capital mistake to theorize before you have all the evidence. It biases the judgment.

When a fact appears to be opposed to a long train of deductions, it invariably proves to be capable of bearing some other interpretation.

I can’t see proof in the dreams of long-dead prophets; you can read anything into them.

The third aspect of my subject is that of science as a method of finding things out. This method is based on the principle that observation is the judge of whether something is so or not. All other aspects and characteristics of science can be understood directly when we understand that observation is the ultimate and final judge of the truth of an idea. But "prove" used in this way really means "test," in the same way that a hundred-proof alcohol is a test of the alcohol, and for people today the idea really should be translated as, "The exception tests the rule." Or, put another way, "The exception proves that the rule is wrong." That is the principle of science. If there is an exception to any rule, and if it can be proved by observation, that rule is wrong.