---
aliases:
  - PI
author: '[[thoughts/Wittgenstein|Ludwig Wittgenstein]]'
category: philosophy
date: '2025-10-07'
description: wittgenstein examines meaning through ordinary uses of language and treats many philosophical problems as confusions about grammar.
id: Philosophical Investigations
language: german
modified: 2026-06-05 15:07:59 GMT-04:00
pdf: https://static1.squarespace.com/static/54889e73e4b0a2c1f9891289/t/564b61a4e4b04eca59c4d232/1447780772744/Ludwig.Wittgenstein.-.Philosophical.Investigations.pdf
posters: '[[library/posters/philosophical-investigations.jpg]]'
seealso:
  - '[[library/Tractatus Logico-Philosophicus|TLP]]'
  - '[[thoughts/forms of life|forms of life]]'
status: current
subcategory:
  - languages
  - metaphysics
tags:
  - philosophy
title: Philosophical Investigations
translator:
  - G. E. M. Anscombe
  - P. M. S. Hacker
  - Joachim Schulte
year: 1953
authors: '[[thoughts/Wittgenstein|Ludwig Wittgenstein]]'
created: '2025-10-07'
published: '2025-10-07'
pageLayout: default
slug: library/Philosophical-Investigations
permalink: https://aarnphm.xyz/library/Philosophical-Investigations.md
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full: https://aarnphm.xyz/llms-full.txt
---
Wittgenstein begins with Augustine’s picture of language as a system in which words name objects and sentences combine those names. The builders in §2 show that this picture works for one simple activity. The rest of the book asks what it leaves out.

## language-games and use

In §7, Wittgenstein calls language joined with the activity around it a language-game. The examples in §23 include giving orders, reporting events, making jokes, thanking, cursing, and praying. Their differences matter because a word does its job within a practice.

Section 43 gives the line people usually quote: for a large class of cases, the meaning of a word is its use in the language. The qualification matters. Wittgenstein is giving a method for examining meaning, rather than a definition that covers every word.

## family resemblance

Sections 65–67 ask what all games have in common. Wittgenstein finds overlapping similarities instead of one feature shared by every case. He calls this family resemblance. The point is practical: a concept can work without a boundary fixed by necessary and sufficient conditions.

This changes the philosophical question. Instead of assuming that a word hides one essence, inspect the cases in which people use it and the distinctions they already make.

## following a rule

The rule-following discussion in §§185–202 examines what makes one application of a rule correct. An interpretation cannot settle the matter by itself because that interpretation can also be read in different ways. Section 202 locates the distinction between following a rule and merely thinking one is following it in a practice.

Training, correction, and repeated use give a rule its place in life. This does not require every competent speaker to recite an explicit theory of the rule. Competence appears in what the speaker goes on to do.

## sensation and private signs

Sections 243–271 test the idea of a language whose words refer to sensations that only one speaker could identify. The diary example in §258 asks how a private sign could retain a standard of correct use if each application were checked only against whatever seemed right at the time.

These passages do not deny pain or inner life. They examine the grammar of sensation words and the public practices in which people learn and use them. The section has produced several competing arguments in the secondary literature, so it is safer to follow the examples than to compress them into one formal proof.

## philosophy as clarification

Wittgenstein describes philosophy as work on confusions created by language. Section 109 calls it a struggle against the bewitchment of intelligence by language. Section 116 says that philosophy brings words back from metaphysical use to everyday use. Section 126 says philosophy puts familiar facts before us and describes them.

The aim is clarity about a particular problem. The book offers reminders, examples, and comparisons that let a misleading picture lose its grip. Its method begins with actual usage and stops when the source of the confusion is visible.

related: [[thoughts/Wittgenstein]], [[thoughts/forms of life]]