XI. “Although Christ did not commit his church to Tiberius, but to Peter, still he did not exclude princes from the care of religion (he called them nursing fathers); nor did he who said “Kiss the Son” repel kings as such. The ministry of the word is committed to pastors; but the care of the state no less to the magistrate; in which state if the church exists, why should not the pious magistrate as such both afford entertainment to the church and keep off the wolves, who in the name of pastors lay waste the flock? Otherwise, by the same argument, I shall have denied that the defense of religion belongs to the magistrate because he gave no commands about religion to Tiberius.”
Francis Turretin, Institutes of Elenctic Theology, Vol.III, — 319
Note in the last sentence, in the quote above, Turretin attempts an reductio ad absurdum. When he wrote that sentence the reductio was effective. Today that reductio is an argument that is actually being put forth with a straight face.
XIV.”Affirmatively there are many things which belong to the magistrate in reference to sacred things.
(1) He ought to establish the sacred doctrine and the pure worship of God in the state according to the prescription of the divine word; faithfully to conserve it when established or even to restore and reform it when declining, as is evident from the passages already quoted concerning Asa, Jehoshaphat, Josiah, Joash, Hezekiah. Hence the design of pious princes and Christian magistrates must be praised, according to which they lent a helping hand to the Reformation (which was in vain expected from the Roman court) and used all their endeavors to cherish and sustain it.
(2) He ought to protect the church according to his ability, to restrain heretics and disturbers of ecclesiastical peace, to promote the glory of God, to defend and propagate the true religion and to hinder the confusion of religions.”
(3)-(6) my fingers are getting tired…there are more good things he says – BLM
XV. “Ecclesiastical power is either internal, direct and formal, occupied with the administration and exercise of sacred things (such as the preaching of the word, the administration of the sacraments and the dispensation of the keys); or extrinsic, indirect and only objective (such as concerned with sacred things, as to procurement and disposition, that all things be done decently and in order in the house of God). The first belongs to pastors alone, to whom he has committed his church and given the keys of the kingdom of heaven; the latter belongs to Christian magistrates and princes, inasmuch as they ought to be the guardians of both tables; as in a well-regulated family the father disposes and arranges all things, the execution and performance of which belongs to the domestics.”
Turretin, Institutes of Elenctic Theology, Vol.III, — 320-321