The test of all knowledge is experiment. Experiment is the sole judge of scientific truth.
We have freedom of speech, and anybody's idea can't be a fact.
Reason is the test of ridicule, not ridicule the test of truth.
Does truth have a moral?
If there's something you really want to believe, that's what you should question the most.
Some people want tolerance to mean now that all ideas are equally valid. That's nonsense. There are some things that are right and there are some things that are wrong.
Sincerity is not a test of truth. We must not make this mistake: He must be right; he's so sincere. Because, it is possible to be sincerely wrong. We can only judge truth by truth and sincerity by sincerity.
We must approach religion with reverence and with love, and our heart will stand up and say, this is truth, and this is untruth.
The grandeur of a philosophy does not certify its truth.
You have to really be careful with what you see and read because you can't believe it all.
There's got to be a point in time where the reality comes home and people realize, here are the facts, and this is either not true or it is true. You've got the facts, you can make your own decision now.
The only good reason to embrace a philosophical position is that you are convinced it is true or at least makes sense of the world better than the alternatives.
Is it true or false that Belfast is north of London? That the galaxy is the shape of a fried egg? That Beethoven was a drunkard? That Wellington won the battle of Waterloo? There are various degrees and dimensions of success in making statements: the statements fit the facts always more or less loosely, in different ways on different occasions for different intents and purposes.
The uniform tenor of a man's life furnishes better evidence of what he has said or done on any particular occasion than the word of any enemy.
The intensity of a conviction that a hypothesis is true has no bearing on whether it is true or false. The importance of the strength of our conviction is only to provide a proportionately strong incentive to find out if the hypothesis will stand up to critical evaluation.
The final test of truth is ridicule. Very few dogmas have ever faced it and survived.
Without subtle ingenuity of mind, one cannot make certain of the truth of their reports.
Truth is a standard both of itself and of falsity.
Truth is about propositions. When it comes to determining truth, it is vital to understand the methods used by individuals in asserting propositions.
It's partly true, too, but it isn't all true. People always think something's all true.
It's the same argument people say about the blogs. The blogs are responsible. No, they're not. The blogs are like anything else. You judge each one based on its own veracity and intelligence and all of that.
Just because someone says something, whether it's at the podium during the briefing or the president tweets, I can't always assume that's factual. That's insane. We have to be very quick on our toes in fact checking.
A skeptic is one who is willing to question any truth claim, asking for clarity in definition, consistency in logic, and adequacy of evidence.
The monopoly of science in the realm of knowledge explains why evolutionary biologists do not find it meaningful to address the question whether the Darwinian theory is true.
When a thought hurts, that’s the signal that it isn’t true.
