Reformation preachers insisted on strict fidelity to the biblical text. Luther warned that a preacher who wanders from the text "is like a maid that goes to market" — distracted and scattered. Calvin established the axiom that only the Law, Prophets, and Apostolic writings belong in the church, countering medieval scholastic additions to doctrine. John Knox extended this to sacramental preparation, insisting that no one be admitted to the Lord's Table without prior examination in the faith, identifying ignorance as the root of heresy.
"A preacher should be a logician and a rhetorician...he must, first, distinguish it. Secondly, he must define, describe, and show what it is. Thirdly, he must produce sentences out of the Scriptures, therewith to prove and strengthen it" — Luther's text-bound, logically structured method of sermon construction, anchored in biblical proof rather than speculation or human invention.
"The cause of heresy is the ignorance of those who have the cure of men's souls" — Knox demanded rigorous catechetical instruction and examination before admission to the sacraments, making the preacher responsible for the congregation's doctrinal health.
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