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At the heart of the Reformation message was a rejection of the power of individual believers, or of the church acting on their behalf, to affect God's judgment about who should be saved and who should be damned. Martin Luther had been convinced, like Augustine, of the powerlessness and unworthiness of fallen humanity, and struck by the force of God's mercy. Good works could not merit this mercy, or affect a sovereign God; instead individual sinners were entirely dependent on God's mercy and justified (saved) by faith alone. Jean Calvin, a generation later, developed more clearly the predestinarian implications - since some men were saved and some were damned, and since this had nothing to do with their own efforts, it must mean that God had created some men predestined for salvation (the elect). This seemed to imply that He must also have predestined other men for damnation (double predestination), a line of argument which led into dangerous territory. Some theologians, Calvin's close associate Beza among them, went further and argued that the entire course of human history was foreordained prior to Adam and Eve's fall in the Garden of Eden. These views (particularly the latter, 'supralapsarian' arguments) seemed to their opponents to suggest that God was the author of the sin, both in Eden and in those who were subsequently predestined for damnation. They also raised a question about Christ's sacrifice on the cross - had that been made to atone for the sins of all, or only of the elect? Because of these dangers many of those with strong predestinarian views were unsure about whether the doctrine should be openly preached. Clever theologians, like expensive lawyers, are adept at failing to push arguments too far and there were many respectable positions short of the one adopted by Beza. But predestination was for many Protestants a fundamental - retreat from this doctrine implied a role for free will expressed in works rather than justification by faith. It thus reopened the door to the corruptions of late-medieval Christianity.
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Michael Braddick (God's Fury, England's Fire: A New History of the English Civil Wars)