During the Crusades, when the Christians were wantonly fighting against their superiors in civilisation and humanity, the doctrine, was promulgated and obeyed that no faith should be kept with infidels, and this was subsequently put in force against heretics. Thousands of Mohammedan prisoners were butchered in cold blood, although their safety had been confirmed by an oath; and this infamous practice was afterwards pursued with respect to the "heretical" sects when the Papal troops desolated some of the fairest parts of Europe. Not only was there no salvation outside the Church, but even the ordinary laws of human society were held to be abrogated. This wickedness, perhaps, reached its culmination in the Spanish conquest of America. Few Christians were civilised enough to condemn these purjured banditti, but Montaigne in France, and Raleigh in England, were glorious exceptions, and both of them were under a just suspicion of heterodoxy. Protestants as well as Catholics were infected with this infamous bigotry. Luther himself was not free from taint, and Calvin's treachery against Servetus is an eternal blot on his character.
"No faith with heretics" took a new form when the downright violation of an oath became too dissonant to the spirit of an improved civilisation. It found expression in robbing the heretic of political and social rights, and above all in treating him as outside the pale of honor. Slandering him was no libel. Every bigot claimed the right to say anything against his character, for the purpose of bringing his opinions into hatred and contempt. All the dictates of charity were cast aside; his good actions were misrepresented, and his failings maliciously exaggerated. If Voltaire spent thousands in charity, he did it for notoriety; if he wrote odes to beautiful or accomplished ladies, he was a wretched debauchee. If Thomas Paine made sacrifices for liberty, he did it because he had a private grudge against authority; if he befriended the wife and family of a distressed Republican, he only sought to gratify his lust; if he spent a convivial hour with a friend, he was an inveterate drunkard; and if he contracted a malignant abscess by lying for months in a damp, unwholesome dungeon, his sufferings were the nemesis............