First published in 1955, this book was intended to offer a new interpretation of early Protestantism and, against this background, a searching treatment of modern religious issues. The Protestant tradition stems mainly from Luther, Calvin, and the Sectarians. Luther was the revolutionary genius; because of his acute sense of paradox his teaching is difficult to understand, but Dr Whale's summing-up makes it a good deal easier. After him Calvin, with his remorseless logic, may seem an unsympathetic figure; but here he is shown in his proper light as the great statesman and doctrinarian of the young church. The Sectarian movement was steadily gaining strength in England in the sixteenth and seventeenth centuries; Dr Whale examines its teachings and tells of its later development. He speaks with conviction and vigour about issues including religious tolerance and intolerance and the conflict between Church and State; he closes with a plea for unity the Church.