From David's list on read before you turn 25.
This is a widely-scorned book whose ideas are no longer in philosophical fashion. But it was the work that first hooked me into philosophy, and I recommend it for its sheer verve and confidence. Freddie Ayer visited Vienna in the 1930s and when he returned to the UK he introduced the ideas of the Vienna Circle into the Anglo-American world. The book argued that propositions that were not testable – for example some assertions about God, or about ethics or aesthetics – were meaningless because they were not verifiable. Amazing claims!
Why should I read it?
What is this book about?
"A delightful book … I should like to have written it myself." — Bertrand Russell
First published in 1936, this first full-length presentation in English of the Logical Positivism of Carnap, Neurath, and others has gone through many printings to become a classic of thought and communication. It not only surveys one of the most important areas of modern thought; it also shows the confusion that arises from imperfect understanding of the uses of language. A first-rate antidote for fuzzy thought and muddled writing, this remarkable book has helped philosophers, writers, speakers, teachers, students, and general readers alike.