I need to read Bellarmine.

And how he explains the separation between temporal authority and spiritual authority.

What Barack Obama Could Learn from St. Robert Bellarmine by Gerald J. Russello

3. Laws affect persons. Bellarmine was adamant in his “On Laymen,” part of a series of works called the Controversiae, published between 1586-89, that “from the fact that political authority is temporal and its end is external peace and that man does not make judgments on internal matters, it is rightly inferred that it can oblige only to perform temporal and external acts but not that it cannot bind in conscience.” This is a crucial point that secularists often overlook, since they have a utilitarian or agnostic view of the law. For them, regulations like the HHS mandate simply preserve “health care” or “equality,” and affect only external actions. For them, such laws do not touch religious belief, which is considered only an internal matter and not one concerned with action.