Libertas §38

³⁸ Next comes the system of those who admit indeed the duty of submitting to God, the Creator and Ruler of the world, inasmuch as all nature is dependent on His will, but who boldly reject all laws of faith and morals which are above natural reason, but are revealed by the authority of God; or who at least impudently assert that there is no reason why regard should be paid to these laws, at any rate publicly, by the State. How mistaken these men also are, and how inconsistent, we have seen above. From this teaching, as from its source and principle, flows that fatal principle of the separation of Church and State; whereas it is, on the contrary, clear that the two powers, though dissimilar in functions and unequal in degree, ought nevertheless to live in concord, by harmony in their action and the faithful discharge of their respective duties.