Inner form showed that languages cut concepts differently. So how does that difference bear on thought? Humboldt’s answer is “worldview (Weltansicht)” — the source of twentieth-century linguistic relativity (the Sapir–Whorf hypothesis). But it is often misread. Read the German closely.

1. A language is a “worldview”

language A's worldview the whole fabric of concepts language B's worldview learning = moving a shared material beneath (the world of the thinkable) = makes translation possible
Each language rings a people with a fabric of concepts. But beneath the circle is common material, and one can pass from circle to circle. Diagram: L/LAB

Jede Sprache zieht um die Nation, welcher sie angehört, einen Kreis, aus dem es nur insofern hinauszugehen möglich ist, als man zugleich in einen anderen hinübertritt.

Every language draws about the people to whom it belongs a circle, from which one can escape only by stepping at the same time into the circle of another. (German quotations throughout; Japanese and English are L/LAB working translations.)

Why a “circle”? Because, Humboldt says, language is not a neutral window onto the world: “man lives with objects mainly — indeed, since feeling and acting in him depend on his representations, exclusively — as language brings them to him” (so, wie die Sprache sie ihm zuführt).

2. But the circle is not a prison

a common misreading: prison the mother tongue determines thought there is no way out translation is in principle impossible Humboldt himself: standpoint the mother tongue tilts how the world looks a foreign language = gaining a new standpoint shared material; translation possible "to a degree"
Humboldt's "circle" is not a prison that shuts thought in but a standpoint from which one can move to another circle. Diagram: L/LAB

The circle passage is opened up in the lines right after it.

Die Erlernung einer fremden Sprache sollte daher die Gewinnung eines neuen Standpunkts in der bisherigen Weltansicht seyn, und ist es in der That bis auf einen gewissen Grad.

The learning of a foreign language should therefore be the gaining of a new standpoint in one’s previous worldview, and to a certain degree it in fact is.

The reason, Humboldt says, is that “every language contains the whole fabric of concepts and the mode of representation of a part of humankind.” Three things to notice. (1) One can leave the circle — by stepping into another. (2) What the move gains is a “new standpoint,” not a swapped-out mind. (3) As the previous piece showed, beneath the circle is a common material — the world of the thinkable. So Humboldt is not a naïve linguistic determinist. Translation is possible “to a certain degree,” he writes himself.

3. “Language = the spirit of a people” — a dangerous formula

Humboldt (1836) "spirit of a people" = a group's mode of thought as shown in its language 19th–20th-century appropriation "the spirit of the national language," "ethnic essence" = linguistic nationalism, racial thought A use foreign to Humboldt's intent. Antidote: Sapir, "Language, Race and Culture" (ch. 10).
"The spirit of a people" was taken out of Humboldt's hands and used for linguistic nationalism. Reading him takes some separating. Diagram: L/LAB

Humboldt’s strongest formula is this.

Die Sprache ist gleichsam die äusserliche Erscheinung des Geistes der Völker; ihre Sprache ist ihr Geist und ihr Geist ihre Sprache; man kann sich beide nie identisch genug denken.

Language is, as it were, the outward appearance of the spirit of peoples; their language is their spirit and their spirit is their language; one can never think the two identical enough.

The line is dangerous. In the nineteenth and twentieth centuries it was appropriated for a linguistic nationalism that spoke of “the spirit of the national language” and “ethnic essence.” Humboldt himself saw languages as varied expressions of one human activity and did not intend a fixed hierarchy (though he did leave a ranking of language types — separate piece). The antidote to that appropriation is Sapir’s Language, chapter 10, “Language, Race and Culture”: “race is supremely indifferent to the history of language and culture.”

4. From Humboldt to Whorf — the line of descent

Humboldt1836 Steinthal1850s Boas1911 Sapir1921 Whorf1940s → "linguistic relativity" separate line: Weisgerber, "the world-picture of the mother tongue" (Germany, 1930s–)
Humboldt's "worldview" passed on in two streams: American anthropology (Boas → Sapir → Whorf) and German linguistic thought (Weisgerber). Diagram: L/LAB

5. Modern “weak” linguistic relativity

the mother tongue does not determine thought, but slightly tilts habitual judgements (empirical work) · colour: speakers with two "blue" words discriminate blue boundaries slightly faster · space: speakers of "absolute frame" (N/S/E/W) languages do better on orientation tasks · gender: if "bridge" is feminine, speakers rate bridges as more "elegant" · time: whether time is talked of left–right or up–down affects how time is spatialised
Modern relativity is a "tilt," not a "prison." Effects are small, bidirectional, task-dependent. Diagram: L/LAB

In the later twentieth century the strong claim that “language determines thought” lost nearly all support. In its place, a weak relativity — “the mother tongue does not determine but slightly tilts perception, memory and judgement” — has been supported experimentally in colour (Kay & Kempton, Winawer), spatial reference frames (Levinson), grammatical gender (Boroditsky), the spatialising of time, and more. Humboldt’s metaphor of a “standpoint” is closer to this modern version: the circle is not a prison but a habit of seeing.

In sum

Humboldt’s claimcaveat
Every language draws a circle around a people = a worldviewa “tilt,” not a “window”
Man lives with objects as language brings them to himbut a common material lies beneath the circle
Learning a foreign language = gaining a new standpoint (translation possible “to a degree”)not naïve linguistic determinism
“Language is the outward appearance of the spirit of a people”a dangerous formula, appropriated by linguistic nationalism; antidote: Sapir ch. 10
→ Steinthal, Boas, Sapir, Whorf / Weisgerbercarried into the twentieth century in two streams

Why it is still read

The Humboldt feature: overview / energeia / inner form / this essay / infinite use of finite means / the organ of thought, and dialogue / typology and ranking.