Grotius[065] thought that the most compendious way to produce universal religious peace among Christians, would be to frame, with the concurrence of all the orthodox Eastern and Western churches, a formulary which should express, briefly and explicitly, all the articles of faith, the belief of which they agree in thinking essential to salvation. In a letter addressed from Paris in 1625,[066] he mentions that Gustavus Adolphus had entertained projects of religious pacification, and had taken measures to effect it; that he had procured a meeting of divines of the Lutheran and Reformed churches and that they had separated amicably: Grotius says that the differences between them were as slight as those between the Greek and Coptic churches. For some time, Grotius flattered himself that he should succeed in his project of pacification. In one of his letters to his brother, he mentions distinguished Protestants, who approved and encouraged them "I perceive," he says, "that by conversing with men of the most learning among the reformed, and explaining my sentiments to them, they are of my opinion; and that their number will increase, if my treatises are dispersed. I can truly affirm, that I have said nothing in them from party spirit, but followed truth as closely as I could."[067] [Sidenote: CHAP. XII.] He imagined that some Catholics entered into his views. "The ablest men among the Catholics," he thus writes to his brother, "think that what I have published is written with great freedom and moderation, and approve of it."[068] These pacific projects of Grotius cemented the union between him and Father Petâu. "I had," says that most learned Jesuit, in his 12th Letter, "a great desire to see and converse with Grotius. We have been long together, and very intimate. He is, as far as I can judge, a good man, and possesses great candour. I do not think him far from becoming a Catholic, after the example of Holstenius as you hoped. I shall neglect nothing in my power to reconcile him to Christ, and put him in the way of salvation."[069] [Sidenote: His Project of Religious Pacification.] [Sidenote: CHAP. XII.] [Sidenote: XII. 3. His Project of Religious Pacification.] [Sidenote: CHAP. XII.] As Grotius lays so much stress on the pacific labours of Erasmus, Wicelius, Cassander and Casaubon, we shall briefly mention, in the present chapter, the labours of the three first: Casaubon's we shall notice, in the second appendix to this work. [Sidenote: XII. 3. His Project of Religious Pacification.]