Whatever is contrary to established manners and customs is immoral. An immoral act or doctrine is not necessarily a sinful one: on the contrary, every advance in thought and conduct is by definition immoral until it has converted the majority. For this reason it is of the most enormous importance that immorality should be protected jealously against the attacks of those who have no standard except the standard of custom, and who regard any attack on custom--that is, on morals--as an attack on society, on religion, and on virtue. A censor is never intentionally a protector of immorality. He always aims at the protection of morality. Now morality is extremely valuable to society. It imposes conventional conduct on the great mass of persons who are incapable of original ethical judgment, and who would be quite lost if they were not in leading-strings devised by lawgivers, philosophers, prophets and poets for their guidance. But morality is not dependent on censorship for protection. It is already powerfully fortified by the magistracy and the whole body of law. Blasphemy, indecency, libel, treason, sedition, obscenity, profanity, and all the other evils which a censorship is supposed to avert, are punishable by the civil magistrate with all the severity of vehement prejudice. Morality has not only every engine that lawgivers can devise in full operation for its protection, but also that enormous weight of public opinion enforced by social ostracism which is stronger than all the statutes. A censor pretending to protect morality is like a child pushing the cushions of a railway carriage to give itself the sensation of making the train travel at sixty miles an hour. It is immorality, not morality, that needs protection: it is morality, not immorality, that needs restraint; for morality, with all the dead weight of human inertia and superstition to hang on the back of the pioneer, and all the malice of vulgarity and prejudice to threaten him, is responsible for many persecutions and many martyrdoms.