“Owing to the identification of religion with virtue, together with the fact that the most religious men are not the most intelligent, a religious education gives courage to the stupid to resist the authority of educated men, as has happened, for example, where the teaching of evolution has been made illegal. So far as I can remember, there is not one word in the Gospels in praise of intelligence; and in this respect ministers of religion follow gospel authority more closely than in some others.”

Source: Why Evolution is True (2009), p. 192

Election address for the 1885 general election, quoted in Blanche E. C. Dugdale, Arthur James Balfour, First Earl of Balfour, K.G., O.M., F.R.S., Etc. 1848–1905 (London: Hutchinson & Co. Ltd, 1936), p. 72
President of the Local Government Board

Source: The Undoing of Thought (1988), p. 22.

Of the Pulpit (13)
Les Caractères (1688)

Source: The Way Toward Health (1997), p. 310

The trial of Charles B. Reynolds for blasphemy (1887)
Context: Now, gentlemen, what is blasphemy? Of course nobody knows what it is, unless he takes into consideration where he is. What is blasphemy in one country would be a religious exhortation in another. It is owing to where you are and who is in authority. And let me call your attention to the impudence and bigotry of the American Christians, We send missionaries to other countries. What for? To tell them that their religion is false, that their gods are myths and monsters, that their saviors and apostles were impostors, and that our religion is true. You send a man from Morristown — a Presbyterian, over to Turkey. He goes there, and he tells the Mohammedans — and he has it in a pamphlet and he distributes it — that the Koran is a lie, that Mohammed was not a prophet of God, that the angel Gabriel is not so large that it is four hundred leagues between his eyes — that it is all a mistake — there never was an angel so large as that. Then what would the Turks do? Suppose the Turks had a law like this statute in New Jersey. They would put the Morristown missionary in jail, and he would send home word, and then what would the people of Morristown say? Honestly -- what do you think they would say? They would say, "Why, look at those poor, heathen wretches. We sent a man over there armed with the truth, and yet they were so blinded by their idolatrous religion, so steeped in superstition, that they actually put that man in prison." Gentlemen, does not that show the need of more missionaries? I would say, yes.
Then what would the Turks do? Suppose the Turks had a law like this statute in New Jersey. They would put the Morristown missionary in jail, and he would send home word, and then what would the people of Morristown say? Honestly -- what do you think they would say? They would say, "Why, look at those poor, heathen wretches. We sent a man over there armed with the truth, and yet they were so blinded by their idolatrous religion, so steeped in superstition, that they actually put that man in prison." Gentlemen, does not that show the need of more missionaries? I would say, yes.

"Canon Law: Ecclesiastical Ministry" (1771)
Questions sur l'Encyclopédie (1770–1774)
Original: (fr) La vertu suppose la liberté, comme le transport d’un fardeau suppose la force active. Dans la contrainte point de vertu, et sans vertu point de religion. Rends-moi esclave, je n’en serai pas meilleur. Le souverain même n’a aucun droit d’employer la contrainte pour amener les hommes à la religion, qui suppose essentiellement choix et liberté. Ma pensée n’est pas plus soumise à l’autorité que la maladie ou la santé.

Introduction
The Natural History of Religion (1757)