“You know, Sadolet, and if you venture to deny, I will make it palpable to all that you knew, yet cunningly and craftily disguised the fact, not only that our agreement with antiquity is far closer than yours, but that all we have attempted has been to renew that ancient form of the Church, which, at first sullied and distorted by illiterate men of indifferent character, was afterwards flagitiously mangled and almost destroyed by the Roman Pontiff and his faction.
I pray, before your eyes, that ancient form of the Church, such as their writings prove it to have been in the age of Chrysostom and Basil, among the Greeks, and of Cyprian, Ambrose, and Augustine, among the Latins; after so doing, contemplate the ruins of that Church, as now surviving among yourselves. Assuredly, the difference will appear as great as that which the Prophets describe between the famous Church which flourished under David and Solomon, and that which under Zedekiah and Jehoiakim had lapsed into every kind of superstition, and utterly vitiated the purity of divine worship. Will you here give the name of an enemy of antiquity to him who, zealous for ancient piety and holiness, and dissatisfied with the state of matters as existing in a dissolute and depraved Church, attempts to ameliorate its condition, and restore it to pristine splendor?
The truth of Prophetical and Evangelical doctrine, on which the Church ought to be founded, has not only in a great measure perished in your Church, but is violently driven away by fire and sword. Will you obtrude upon me, for the Church, a body which furiously persecutes everything sanctioned by our religion, both as delivered by the oracles of God, and embodied in the writings of holy Fathers, and approved by ancient Councils? Where, pray, exist among you any vestiges of that true and holy discipline, which the ancient bishops exercised in the Church? Have you not scorned all their institutions? Have you not trampled all the Canons under foot? Then, your nefarious profanation of the sacraments I cannot think of without the utmost horror.
In the Sacraments, all we have attempted is to restore the native purity from which they had degenerated, and so enable them to resume their dignity. Ceremonies we have in a great measure abolished, but we were compelled to do so, partly because by their multitude they had degenerated into a kind of Judaism, partly because they had filled the minds of the people with superstition, and could not possibly remain without doing the greatest injury to the piety which it was their office to promote. Still we have retained those which seemed sufficient for the circumstances of the times.
Do you remember what kind of time it was when our Reformers appeared, and what kind of doctrine candidates for the ministry learned in the schools? You yourself know that it was mere sophistry, and sophistry so twisted, involved, tortuous, and puzzling, that scholastic theology might well be described as a species of secret magic. The denser the darkness in which any one shrouded a subject, the more he puzzled himself and others with preposterous riddles, the greater his fame for acumen and learning. And when those who had been formed in that forge wished to carry the fruit of their learning to the people, with what skill, I ask, did they edify the Church?”
-John Calvin’s Letter to Cardinal Sadoleto (1539)
Read the whole letter: https://www.monergism.com/john-calvins-letter-cardinal-sadoleto-1539