But if criticism was thus the stimulating principle that had given life to the Reformation, it had no little to do with its pause; and this is the influence over which Rome had no kind of control, and to which I have made allusion. The phases through which the Reformation passed were dependent on the coincident advances of learning. First it relied on the Scriptures, which were to the last its surest support; then it included the Fathers. [Sidenote: Decline of the value of patristic learning.] But, from a more intimate study of the latter, many erudite Protestants were gradually brought back to the ancient fold. Among such may be mentioned Erasmus, who by degrees became alienated from the Reformers, and subsequently Grotius, the publication of whose treatise, "De jure belli et pacis," 1625, really constituted an epoch in the political system of Europe. This great man had gradually become averse to the Reformation, believing that, all things considered, it had done more harm than good; he had concluded that it was better to throw differences into oblivion for the sake of peace, and to enforce silence on one's own opinions, rather than to expect that the Church should be compelled to accommodate herself to them. If such men as Erasmus, Casaubon, and Grotius had been brought to this dilemma by their profound philosophical meditations, their conclusion was confirmed among the less reflecting by the unhappy intolerance of the new as well as the old Church. [Sidenote: Moral effects of persecutions.] Men asked what was the difference between the vindictiveness with which Rome dealt with Antonio de Dominis, at once an ecclesiastic and a natural philosopher, who, having gone over to Protestantism and then seceded, imprudently visited Rome, was there arrested, and dying, his body was dug up and burnt, and the rigour of Calvin, who seized Servetus, the author of the "Christianismi Restitutio," and in part the discoverer of the circulation of the blood, when he happened to pass through Geneva, and committed him to the flames.