VII. The protest of Spire had still further increased the indignation of the Papal adherents; and Charles the Fifth, according to the oath he had made at Barcelona, set about preparing "a suitable antidote for the pestilential disease with which the Germans were attacked, and to avenge in a striking manner the insult offered to Jesus Christ."[185] The Pope, on his part, endeavoured to combine all the other princes of Christendom in this crusade; and the peace of Cambray, concluded on the 5th August, tended to the accomplishment of his cruel designs. It left the Emperor's hands free against the heretics. After having entered their protest at Spire, it was necessary for the Evangelicals to think of maintaining it. [185] Illatamque Christo injuriam pro viribus ulciscentur.--(Dumont, Corp. Univ. Diplomatique, iv. p. 1, 5.) The Protestant states that had already laid the foundations of an evangelical alliance at Spire, had agreed to send deputies to Rothach; but the Elector, staggered by the representations of Luther, who was continually saying to him, "It is by keeping yourselves tranquil and in quietness that you will be saved,"[186] ordered his deputies to listen to the propositions of his allies, but to decide upon nothing. They adjourned to a new conference, which never took place. Luther triumphed; for human alliances failed. "Christ the Lord will know how to deliver us without the Landgrave, and even against the Landgrave," said he to his friends.[187] [186] Isaiah xxx. 15. L. Epp. iii. p. 454. [187] Unser Her. Christus, &c.--(Ibid.) This confidence of Luther shocks a Lutheran historian--Plank, ii. p. 454. [Sidenote: DIFFICULTY OF UNION.] Philip of Hesse, who was vexed at Luther's obstinacy, was convinced that it arose from a dispute about words. "They will hear no mention of alliances because of the Zwinglians," said he; "well then, let us put an end to the contradictions that separate them from Luther." The union of all the disciples of the Word of God seemed in fact a necessary condition to the success of the Reform. How could the Protestants resist the power of Rome and of the Empire, if they were divided? The Landgrave no doubt wished to unite their minds, that he might afterwards be able to unite their arms; but the cause of Christ was not to triumph by the sword. If they should succeed in uniting their hearts and prayers, the Reform would then find such strength in the faith of its children, that Philip's spearmen would no longer be necessary.