Tractatus Logico-Philosophicus · Chapter
5.61 explained
Logic is coextensive with the world; its limits are the limits of the world.
What happens
Logic is coextensive with the world; its limits are the limits of the world. We cannot assert in logic that something exists or does not exist in the world, because that would require stepping outside those limits. What cannot be thought cannot be said.
Free preview opens on this chapter — companions, themes, and character notes appear beside the text.
Narrative arc
Story tension across the book — this chapter sits in Falling action.
- 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 readingThemes in this chapter
- Limits of Language and Thought
The proposition directly addresses the boundary of what can be thought and said, asserting that logic cannot go beyond the world's limits.
- Solipsism and the Subject
Implicitly touches on the subject's perspective, as the limits of the world are also the limits of logic and thought.
Characters to notice
- Mr. Wittgenstein
Author of the proposition; presents the argument that logic cannot transcend the limits of the world.
Key passages
“Logic fills the world: the limits of the world are also its limits.”
Logic permeates the entire world, and the boundaries of the world are the same as the boundaries of logic.
Establishes the identity of logical and worldly limits.
“We cannot therefore say in logic: This and this there is in the world, that there is not.”
Within logic, we cannot make statements about what exists or does not exist in the world.
Highlights the impossibility of logical assertions about existence without transcending the world.
“What we cannot think, that we cannot think: we cannot therefore say what we cannot think.”
If something is unthinkable, it is also unsayable.
Reinforces the connection between thought and language, and the limits of both.
