"Granting that an illusion may have its uses, it can only be of service so long as we do not know it to be an illusion."

“The average man is happier in the wrong with a crowd, than he is in the right with only one or two companions.”

“Facts are more insistent than theories, and in the last resort it is the nature of things which determine the course of our actions.”

“Of the four terms ... Praise, Blame, Punishment, and Responsibility, the cardinal and governing one is the last.”

“So far as Christianity is concerned it would puzzle the most zealous of its defenders to indicate a single direction in which it did anything to encourage the slightest modification of the spirit of intolerance. Mohammedans can at least point to a time when, while their religion was dominant, a considerable amount of religious freedom was allowed to those living under its control. In the palmy days of the Mohammedan rule in Spain both Jews and Christians were allowed to practise their religion with only trifling inconveniences, certainly without being exposed to the fiendish punishments that characterized Christianity all over the world. Moreover, it must never be overlooked that in Europe all laws against heresy are of Christian origin. In the old Roman Empire liberty of worship was universal. So long as the State religion was treated with a moderate amount of respect one might worship whatever god one pleased, and the number was sufficient to provide for the most varied tastes. When Christians were proceeded against it was under laws that did not aim primarily to shackle liberty of worship or of opinion. The procedure was in every case formal, the trial public, time was given for the preparation of the defence, and many of the judges showed their dislike to the prosecutions. But with the Christians, instead of persecution being spasmodic it was persistent. It was not taken up by the authorities with reluctance, but with eagerness, and it was counted as the most sacred of duties.”

“Gods are fragile things, they may be killed by a whiff of science or a dose of common sense. They thrive on servility and shrink before independence. They feed upon worship as kings do upon flattery. That is why the cry of gods at all times is "Worship us or we perish.”

“Human society is born in the shadow of religious fear, and in that stage the suppression of heresy is a sacred social duty. Then comes the rise of a priesthood, and the independent thinker is met with punishment in this world and the threat of eternal damnation hereafter. Even today it is from the religious side that the greatest danger to freedom of thought comes. Religion is the last thing that man will civilise.”