← All chapters

Tractatus Logico-Philosophicus · Chapter

6.3211 explained

Wittgenstein discusses the a priori certainty of the 'law of least action,' noting that the idea preceded precise knowledge, and that such certainty is purely logical.

What happens

Wittgenstein discusses the a priori certainty of the 'law of least action,' noting that the idea preceded precise knowledge, and that such certainty is purely logical.

Free preview opens on this chapter — companions, themes, and character notes appear beside the text.

Narrative arc

Story tension across the book.

SetupAftermathClimax
  • Setup
  • Escalation
  • Breaking point
  • Aftermath
  • Closing

This passage marks the story’s dramatic climax because it presents the moment when the protagonist’s obsessive…

Full beat labels and climax notes unlock in the reader.

Follow the arc while reading

Themes in this chapter

  • Logic and Tautology

    The a priori certainty of the law of least action is identified as purely logical, aligning with the theme that logical propositions are tautologies.

Characters to notice

  • Mr. Wittgenstein

    Author of the proposition; presents the observation about the law of least action.

Key passages

  • “Men had indeed an idea that there must be a “law of least action,” before they knew exactly how it ran. (Here, as always, the a priori certain proves to be something purely logical.)”

    People intuitively believed in a 'law of least action' before its precise formulation, and this a priori certainty is always a matter of logic, not empirical fact.

    Wittgenstein uses the law of least action to demonstrate that a priori certainty is logical in nature.