 Yet science assumes that the world forms a well-ordered, systematic unity where all events can be subsumed under causal laws. As just indicated, we rely on a basic version of this principle when we judge that some impressions are illusions or dreams. It should also be clear that, however coherent our experiences might be, they are bound to be finite in extent. That is, we could never experience enough to justify this apparently cosmological claim that every object and event conforms to causal laws—let alone that these laws will continue to hold in the  future.[6]  Nonetheless, Kant argues that reason is justified in adopting these principles (among others), so long as it does not treat these as knowledge claims. This is his distinction between the “constitutive” and “regulative” use of ideas. (See, e.g., Buchdahl 1992; Friedman 1992c;  Kant’s theory of judgment,  §4.2.)