The land of pure understanding is an island, enclosed by nature itself within unalterable limits: the land of truth, surrounded by a wide and stormy ocean that is the true seat of illusion.
A 235–236 / B 294–295 (AA 3:202.15–19). The image is Kant's own and the claim keeps it as an image: the "unveränderliche Grenzen" are set "durch die Natur selbst", and what lies beyond is "der eigentliche Sitz des Scheins", not a further land. The literal content, that the understanding's principles serve only for experience, is the next passage (3:203.04–09) and its own claim.
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