“Virtue is the mistress of all things. Virtue is the master of all things.”

What Would You Substitute for the Bible as a Moral Guide? (1900)
Context: These religions teach the slave virtues. They make inanimate things holy, and falsehoods sacred. They create artificial crimes. To eat meat on Friday, to enjoy yourself on Sunday, to eat on fast-days, to be happy in Lent, to dispute a priest, to ask for evidence, to deny a creed, to express your sincere thought, all these acts are sins, crimes against some god, To give your honest opinion about Jehovah, Mohammed or Christ, is far worse than to maliciously slander your neighbor. To question or doubt miracles. is far worse than to deny known facts. Only the obedient, the credulous, the cringers, the kneelers, the meek, the unquestioning, the true believers, are regarded as moral, as virtuous. It is not enough to be honest, generous and useful; not enough to be governed by evidence, by facts. In addition to this, you must believe. These things are the foes of morality. They subvert all natural conceptions of virtue.

Canto V
Queen Mab (1813)

"Quotes", The Educated Imagination (1963), Talk 6: The Vocation of Eloquence

Lettre sur les aveugles [Letter on the Blind] (1749)
Context: As to all the outward signs that awaken within us feelings of sympathy and compassion, the blind are only affected by crying; I suspect them in general of lacking humanity. What difference is there for a blind man, between a man who is urinating, and man who, without crying out, is bleeding? And we ourselves, do we not cease to commiserate, when the distance or the smallness of the objects in question produce the same effect on us as the lack of sight produces in the blind man? All our virtues depend on the faculty of the senses, and on the degree to which external things affect us. Thus I do not doubt that, except for the fear of punishment, many people would not feel any remorse for killing a man from a distance at which he appeared no larger than a swallow. No more, at any rate, than they would for slaughtering a cow up close. If we feel compassion for a horse that suffers, but if we squash an ant without any scruple, isn’t the same principle at work?

Нет бессмертия души, так нет и добродетели, значит, всё позволено. … Без бога-то и без будущей жизни? Ведь это, стало быть, теперь всё позволено, всё можно делать?
The Brothers Karamazov (1879–1880)

Discourse V, pt. 9.
The Idea of a University (1873)

Al-Khisal, p. 4
[Baqir Shareef al-Qurashi, Jasim al-Rasheed, The Life of Imam Muhammad ibn 'Ali al-Baqir, His traditions from the Prophet, 1999]

Part I, ch. 21.
The Compleat Angler (1653-1655)