But the chief thing is, that Christ, the Sun of Righteousness, has so irradiated your mind with the light of his Gospel, that you understand that the true way of governing the Church is no other than what is to be derived from him, and that you at the same time know the difference between that genuine form of religion which he has instituted, and that fictious and degenerate form which was afterwards introduced; for you wholly understand that God’s worship has been corrupted and deformed, as innumerable superstitions have crept in, that the grace of Christ has been unworthily involved in great darkness, that the virtue of his death has been annihilated, that he himself has been almost lacerated and torn in pieces, that assurance of salvation has been plucked up by the roots, that consciences have been miserably and even horribly vexed and tormented, that wretched men have been led away from the sincere and right worship of God into various and perplexed labyrinths, that the Church has been cruelly and tyrannically oppressed; and, in short, that no real Christianity has been left.

—John Calvin (1549), Commentary on the Epistle of Paul the Apostle to the Hebrews, trans. John Owen (Bellingham, WA: Logos Bible Software, 2010), xxii.