Calvin, who recognized the hand of Castellio in this powerful defence of freedom of thought, called his opponent "a monster full of poison and madness," and proceeded to demolish him in a Reply. In his _Contra libellum Calvini_, which is an answer to this Reply, Castellio declares that Calvin's act in burning Servetus was a bloody act, and that now his book is a direct menace to honest, pious people. "I," he adds, "who have a horror of blood, propose to examine the book. I do not defend Servetus. I have never read his books. Calvin burned them together with their author. I do not want to burn Calvin or to burn his book. I am only going to _answer_ it." He notes that Calvin complains of "novelties and innovations," a strange complaint, he thinks, from a man who "has introduced more innovations in ten years than the entire Church had introduced in six centuries!" All the sects, he reminds the great Reformer, claim to be founded on the Word of God. They all believe that their religion is true. Calvin says that his is _the only true one_. Each of the others says that his is the only true one. Calvin says that they are wrong. He makes himself (by what right I do not know) the judge and sovereign arbiter. He claims that he has on his side the sure evidence of the Word of God. Then why does he write so many books to prove what is evident? The truth is surely not evident to those who die denying that it is truth! Calvin asks how doctrine is to be guarded if heretics are not to be punished. "Doctrine," cries Castellio, "Christ's doctrine means loving one's enemies, returning good for evil, having a pure heart and a hunger and thirst for righteousness. _You_ may return to Moses if you will, but for us others Christ has come." Love, he constantly insists, is the supreme badge of any true Christianity, and the traits of the beatitudes in a person's life are a surer evidence that he belongs in {97} Christ's family, than is the fact that he holds current opinions on obscure questions of belief. "Before God," he writes in his _Defensio_, a work of the year 1562, to those who wish to hunt him off the face of the earth, "and from the bottom of my heart, I call you to the spirit of love." "By the bowels of Christ, I ask and implore you to leave me in peace, to stop persecuting me. Let me have the liberty of my faith as you have of yours. At the heart of religion I am one with you. It is in reality the same religion; only on certain points of interpretation I see differently from you. But however we differ in opinion, why cannot we love one another?"