1. THERE are some men whose lives it is impossible to study without receiving the impression that they were expressly sent into the world to do a work required by the juncture of history on which they fell. The story of the Reformation, for example, cannot be read by a devout mind without wonder at the providence by which such great men as Luther, Zwingli, Calvin, and Knox were simultaneously raised up in different parts of Europe to break the yoke of the papacy and republish the gospel of grace.