Now this being of reason (ens rationis ratiocinatae)d is, to be sure, a mere idea, and is therefore not assumed absolutely and in itself as something actual, but is rather taken as a ground only problematically (because we cannot reach it through any concepts of the understanding), so as to regard all the connection of things in the world of sense as if they had their ground in this being of reason; but solely with the intention of grounding on it the systematic unity that is indispensable to reason and conducive in every way to empirical cognition of the understanding but can never be obstructive to it.