Quotes from book
Language, Truth, and Logic

Name: Language, Truth, and Logic
Author: Alfred Jules Ayer

Language, Truth and Logic is a 1936 book by the philosopher by Alfred Jules Ayer. It brought some of the ideas of the Vienna Circle and the logical empiricists to the attention of the English-speaking world.

“If now I…say "Stealing money is wrong," I produce a sentence which has no factual meaning — that is, expresses no proposition which can be either true or false. It is as if I had written "Stealing money!!" — where the shape and thickness of the exclamation marks show, by a suitable convention, that a special sort of moral disapproval is the feeling which is being expressed.”

Alfred Jules Ayer book Language, Truth, and Logic

Source: Language, Truth, and Logic (1936), p. 107.

“"I exist" does not follow from "there is a thought now." The fact that a thought occurs at a given moment does not entail that any other thought has occurred at any other moment, still less that there has occurred a series of thoughts sufficient to constitute a single self. As Hume conclusively showed, no one event intrinsically points to any other. We infer the existence of events which we are not actually observing, with the help of general principle. But these principles must be obtained inductively. By mere deduction from what is immediately given we cannot advance a single step beyond. And, consequently, any attempt to base a deductive system on propositions which describe what is immediately given is bound to be a failure.”

Alfred Jules Ayer book Language, Truth, and Logic

Source: Language, Truth, and Logic (1936), p. 47.

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

Alfred Jules Ayer book Language, Truth, and Logic

Source: Language, Truth, and Logic (1936), p. 16.
Context: The criterion which we use to test the genuineness of apparent statements of fact is the criterion of verifiability. We say that a sentence is factually significant to any given person, if, and only if, he knows how to verify the proposition which it purports to express — that is, if he knows what observations would lead him, under certain conditions, to accept the proposition as being true, or reject it as being false.

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

Alfred Jules Ayer book Language, Truth, and Logic

Source: Language, Truth, and Logic (1936), p. 77.
Context: The principles of logic and mathematics are true simply because we never allow them to be anything else. And the reason for this is that we cannot abandon them without contradicting ourselves, without sinning against the rules which govern the use of language, and so making our utterances self-stultifying. In other words, the truths of logic and mathematics are analytic propositions or tautologies.

“The problem of induction is, roughly speaking, the problem of finding a way to prove that certain empirical generalizations which are derived from past experience will hold good also in the future.”

Alfred Jules Ayer book Language, Truth, and Logic

Source: Language, Truth, and Logic (1936), p. 49.
Context: The problem of induction is, roughly speaking, the problem of finding a way to prove that certain empirical generalizations which are derived from past experience will hold good also in the future. There are only two ways of approaching this problem on the assumption that it is a genuine problem, and it is easy to see that neither of them can lead to its solution.

“To make our position clearer, we may formulate it in another way. Let us call a proposition which records an actual or possible observation an experiential proposition. Then we may say that it is the mark of a genuine factual proposition, not that it should be equivalent to an experiential proposition, or any finite number of experiential propositions, but simply that some experiential propositions can be deduced from it in conjunction with certain other premises without being deducible from those other premises alone.”

Alfred Jules Ayer book Language, Truth, and Logic

Source: Language, Truth, and Logic (1936), p. 20.

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

Alfred Jules Ayer book Language, Truth, and Logic

Source: Language, Truth, and Logic (1936), Ch. 1, first lines.
Context: The traditional disputes of philosophers are, for the most part, as unwarranted as they are unfruitful. The surest way to end them is to establish beyond question what should be the purpose and method of a philosophical enquiry. And this is by no means so difficult a task as the history of philosophy would lead one to suppose. For if there are any questions which science leaves it to philosophy to answer, a straightforward process of elimination must lead to their discovery.