Full Idea
Empirical universality is an increase in validity from most cases to all cases (e.g. all bodies are heavy), whereas strict universality belongs to a judgement essentially; this points to a special faculty of a priori cognition for it.
Gist of Idea
Judgements which are essentially and strictly universal reveal our faculty of a priori cognition
Source
Immanuel Kant (Critique of Pure Reason [1781], B004)
Book Reference
Kant,Immanuel: 'Critique of Pure Reason', ed/tr. Guyer,P /Wood,A W [CUO 1998], p.137
A Reaction
I would say that 'strict' universality arises not directly from some faculty, but from increasing degrees of refinement by abstraction. It is merely the iterations of a lower faculty, not the pure deliverances of a higher one.