The caricature of John Calvin as an iron theo-logician, sans cæur et sans entrailles, is endlessly repeated. According to Will Durant, Calvin's ‘genius lay not in conceiving new ideas but in developing the thought of his predecessors to ruinously logical conclusions’. Calvin's Institutes therefore are ‘the most eloquent, fervent, lucid, logical, influential, and terrible work in all the literature of religious revolution’. Calvin did not have the tolerance of those who can conceive the possibility that they might be wrong because ‘Calvin, with lethal precosity, had been certain almost from his twentieth year’ Likewise Stefan Zweig saw in Calvin an inexorable logic, a mathematically precise nature, a monomania, and a terrific and sinister self-assurance. H. Jackson Forstmann writes that ‘one of the most impressive facts about Calvin's writings is the absolute certainty reflected by the author at every point’. Again, ‘the most striking impression which comes with reading the work of Calvin is the unfailing certainty which pervades the whole corpus”. Forstmann also quotes Doumergue to the effect that Calvin ‘was tormented by an incomparable need for certainty’. However, Doumergue was talking about something more than logical certainty. Calvin was indeed ‘logical, going to the bottom of questions, practical, completely preoccupied with piety, tormented by an incomparable need of certainty; unifying in rare mixture the reasons and sentiments; preceding Pascal, by invoking the reasons that reason does not know, and preceding also the modern theologians of Christian experience.’