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The common thread, from Reformer to Reformer, was an undying commitment to the authority and sufficiency of Scripture, such that they were willing to sacrifice everything, including their own lives, to get the Word of God into the hands of the people. They did this because they understood that the power for spiritual reformation and revival was not in them, but in the gospel (cf. Rom. 1:16–17). And they used the Latin phrase Sola Scriptura (“Scripture alone”) to emphasize the truth that God’s Word was the true power and ultimate authority behind all they said and did.

It was ignorance of Scripture that made the Reformation necessary. It was the recovery of the Scripture that made the Reformation possible. And it was the power of the Scripture that gave the Reformation its enduring impact, as the Holy Spirit brought the truth of His Word to bear on the hearts and minds of individual sinners, transforming them, regenerating them, and giving them eternal life.

Case in point:

Calvin's preaching was of one kind from beginning to end: he preached steadily through book after book of the Bible. He never wavered from this approach to preaching for almost twenty-five years of ministry in St. Peter's church of Geneva - with the exception of a few high festivals and special occasions. "On Sunday he took always the New Testament, except for a few Psalms on Sunday afternoons. During the week . . . it was always the Old Testament". The records show fewer than half a dozen exceptions for the sake of the Christian year. He almost entirely ignored Christmas and Easter in the selection of his text. To give you some idea of the scope of the Calvin's pulpit, he began his series on the book of Acts on August 25, 1549, and ended it in March of 1554. After Acts he went on to the epistles to the Thessalonians (46 sermons), Corinthians (186 sermons), pastorals (86 sermons), Galatians (43 sermons), Ephesians (48 sermons) - till May 1558. Then there is a gap when he is ill. In the spring of 1559 he began the Harmony of the Gospels and was not finished when he died in May, 1564. During the week of that season he preached 159 sermons on Job, 200 on Deuteronomy, 353 on Isaiah, 123 on Genesis and so on. One of the clearest illustrations that this was a self-conscious choice on Calvin's part was the fact that on Easter Day, 1538, after preaching, he left the pulpit of St. Peter's, banished by the City Council. He returned in September, 1541 - over three years later - and picked up the exposition in the next verse.
-- excerpted from John Piper's The Divine Majesty Of The Word