Alfred Jules "Freddie" Ayer (29 October 1910 – 27 June 1989) was a British philosopher known for his promotion of logical positivism, particularly in his books Language, Truth, and Logic (1936) and The Problem of Knowledge (1956).

Ayer was a Special Operations Executive and MI6 agent during the Second World War. He was the Grote Professor of the Philosophy of Mind and Logic at University College London from 1946 until 1959, when he became Wykeham Professor of Logic at the University of Oxford. He was president of the Aristotelian Society from 1951 to 1952. He was knighted in 1970.

Among British philosophers of the 20th century, he has been ranked by Stanford as second only to Bertrand Russell.

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Sir Alfred Jules Ayer Poems

Sir Alfred Jules Ayer Quotes

The traditional disputes of philosophers are, for the most part, as unwarranted as they are unfruitful.
A.J. (Alfred Jules), Sir Ayer (1910-1989), British philosopher. Opening sentence. Language, Truth and Logic, ch. 1 (1936).
I am using it [the word 'perceive'] here in such a way that to say of an object that it is perceived does not entail saying that it exists in any sense at all. And this is a perfectly correct and familiar usage of the word.
A.J. (Alfred Jules), Sir Ayer (1910-1989), British philosopher. Quoted in Sense and Sensibilia, p. 85, ed. J.L. Austin, Oxford University Press (1962).
To say that authority, whether secular or religious, supplies no ground for morality is not to deny the obvious fact that it supplies a sanction.
A.J. (Alfred Jules), Sir Ayer (1910-1989), British philosopher. Title essay, The Meaning of Life and Other Essays (1990).

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