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There never comes a point where a theory can be said to be true. The most that one can claim for any theory is that it has shared the successes of all its rivals and that it has passed at least one test which they have failed.

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Truth

More quotes by A. J. Ayer

The criterion which we use to test the genuineness of apparent statements of fact is the criterion of verifiability.

Language, Truth, and Logic (1936)

"I exist" does not follow from "there is a thought now."

Language, Truth, and Logic (1936)

No moral system can rest solely on authority.

Humanist Outlook (1968)

The principles of logic and mathematics are true simply because we never allow them to be anything else.

Language, Truth, and Logic (1936)

The traditional disputes of philosophers are, for the most part, as unwarranted as they are unfruitful.

Language, Truth, and Logic (1936)

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You have to start with the truth. The truth is the only way that we can get anywhere. Because any decision-making that is based upon lies or ignorance can't lead to a good conclusion.

Julian Assange

False words are not only evil in themselves, but they infect the soul with evil.

Socrates

I believe in evil. It is the property of all those who are certain of truth. Despair and fanaticism are only differing manifestations of evil.

Edward Teller

Wars produce many stories of fiction, some of which are told until they are believed to be true.

Ulysses S. Grant Personal Memoirs of General U. S. Grant (1885)

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Quote text and notes from Wikiquote: A. J. Ayer (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.