 For Kant, the “constitutive” use of our faculties helps to constitute the objects of knowledge, by providing their form as objects of possible experience. Constitutive principles thereby have a strong objective standing—the paradigm case being the categories of the understanding. Regulative principles, by contrast, govern our theoretical activities but offer no (constitutive) guarantees about the objects under investigation. As Kant puts it, activities must have goals if they are not to degenerate into merely random groping (cf. Bvii, A834/B862). Science aims to discover the greatest possible completeness and systematicity (cf. Guyer 1989 &amp; 2006, Abela 2006, Mudd 2017), subsuming objects and events under the most all-encompassing laws. When Kant speaks of the “unity of reason” in the first Critique, he means that reason gives “unity a priori through concepts to the understanding’s manifold cognitions” (A302/B359; cf. A665/B693, A680/B780). 