If this is so, then he must admit that if one is false the other cannot be true; and it hardly seems possible to me that there is a right-minded, sane man, except Mr. Black, who now believes that a God of infinite kindness and justice ever commanded one nation to exterminate another; ever ordered his soldiers to destroy men, women, and babes; ever established the institution of human slavery; ever regarded the auction-block as an altar, or a bloodhound as an apostle. Mr. Black contends (after having answered my indictment against the Old Testament by admitting the allegations to be true) that the rapidity with which Christianity spread "proves the supernatural origin of the Gospel, or that it was propagated by the direct aid of the Divine Being himself." Let us see. In his efforts to show that the "infallible God established slavery in Judea," he takes occasion to say that "the doctrine that slavery is a crime under all circumstances was first started by the adherents of a political faction in this, country less than forty years ago;" that "they denounced God and Christ for not agreeing with them;" but that "they did not constitute the civilized world; nor were they, if the truth must be told, a very respectable portion of it." Let it be remembered that this was only forty years ago; and yet, according to Mr. Black, a few disreputable men changed the ideas of nearly fifty millions of people, changed the Constitution of the United States, liberated a race from slavery, clothed three millions of people with political rights, took possession of the Government, managed its affairs for more than twenty years, and have compelled the admiration of the civilized world. Is it Mr. Black's idea that this happened by chance? If not, then according to him, there are but two ways to account for it; either the rapidity with which Republicanism spread proves its supernatural origin, "or else its propagation was provided for and carried on by the direct aid of the Divine Being himself." Between these two, Mr. Black may make his choice. He will at once see that the rapid rise and spread of any doctrine does not even tend to show that it was divinely revealed.