---
tags:
  - philosophy
id: Language, Truth & Logic
title: Language, Truth & Logic
date: '2025-12-18'
description: ayer argues that cognitively meaningful propositions are either analytic or open to empirical verification.
finished: 2026
year: 1936
status: finished
subcategory:
  - languages
  - logic
author:
  - A. J. Ayer
posters: '[[library/posters/language-truth-logic.jpg|language-truth-logic.jpg]]'
category:
  - philosophy
translator: null
notebook: null
aliases: null
authors:
  - A. J. Ayer
created: '2025-12-18'
modified: '2025-12-18'
published: '2025-12-18'
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A book about meaning, and an argument for the verification principle in logical positivism. Ayer makes the conditions explicit: a statement is cognitively meaningful if it is a tautology, true by virtue of its meaning or logical form, or if empirical observation can count for or against it. Verification need not amount to certainty.

Philosophy becomes, under this criterion, an activity of defining and clarifying the logical relationships of empirical propositions. The shift from metaphysical discourse is severe: before a claim can be disputed, it must establish what would count as evidence. I have to ask what I could observe that would give my words a meaning, and accept that some of the questions I wanted to ask may lose their standing altogether.

This becomes more difficult to leave on the page when Ayer considers how to distinguish a conscious man from an unconscious machine. He places the distinction in perceptible behaviour, in the empirical tests through which consciousness could be recognised.[^consciousness] Reading him alongside modern machine learning, I return to the difficulty of that demand: to say what would justify attributing consciousness to a machine, and what grounds would remain for withholding it once those conditions were met.

[^consciousness]: A. J. Ayer, [_Language, Truth and Logic_](https://www.agathonlibrary.com/wp-content/uploads/2022/01/Ayer-Alfred-Jules-Language-truth-and-logic_text.pdf), chapter VII, p. 130.