“Everybody makes fun of virtue, which by now has, as its primary meaning, an affectation of prudery practiced by hypocrites and the impotent.”

Source: The Doctrine of the Mean

Source: "Quotes", The Great Code: The Bible and Literature (1982), Chapter Three, p. 61

Source: Fifty years of information progress (1994), p. 7: Introduction.

Speech to the National Convention, (5 February 1794), as quoted in The Bolshevik Revolution, 1917-1923, Vol. 1 (1951) by Edward Hallett Carr, p. 154
Variant translations:
The attribute of popular government in a revolution is at one and the same time virtue and terror. Terror without virtue is fatal; virtue without terror is impotent. The terror is nothing but justice, prompt, severe, inflexible; it is thus an emanation of virtue.
As quoted in Red Star Over Southern Africa (1988) by Morgan Norval, p. xvi
If the mainspring of popular government in peace time is virtue, its resource during a revolution is at one and the same time virtue and terror; virtue, without which terror is merely terrible; terror, without which virtue is simply powerless.
As quoted in Rousseau, Robespierre and English Romanticism (1999) by Gregory Dart
Terror is nothing other than justice, prompt, severe, inflexible; it is therefore an emanation of virtue; it is not so much a special principle as it is a consequence of the general principle of democracy applied to our country's most urgent needs.
Original French: La terreur n'est autre chose que la justice prompte, sévère, inflexible; elle est donc une émanation de la vertu ; elle est moins un principe particulier, qu’une conséquence du principe général de la démocratie, appliqué aux plus pressants besoins de la patrie.
From Sur les principes de morale politique http://www.royet.org/nea1789-1794/archives/discours/robespierre_principes_morale_politique_05_02_94.htm

The monster to Robert Walton
Frankenstein (1818)
Context: I seek not a fellow feeling in my misery. No sympathy may I ever find. When I first sought it, it was the love of virtue, the feelings of happiness and affection with which my whole being overflowed, that I wished to be participated. But now that virtue has become to me a shadow, and that happiness and affection are turned into bitter and loathing despair, in what should I seek for sympathy? I am content to suffer alone while my sufferings shall endure; when I die, I am well satisfied that abhorrence and opprobrium should load my memory. Once my fancy was soothed with dreams of virtue, of fame, and of enjoyment. Once I falsely hoped to meet with beings who, pardoning my outward form, would love me for the excellent qualities which I was capable of unfolding. I was nourished with high thoughts of honour and devotion. But now crime has degraded me beneath the meanest animal. No guilt, no mischief, no malignity, no misery, can be found comparable to mine. When I run over the frightful catalogue of my sins, I cannot believe that I am the same creature whose thoughts were once filled with sublime and transcendent visions of the beauty and the majesty of goodness. But it is even so; the fallen angel becomes a malignant devil. Yet even that enemy of God and man had friends and associates in his desolation; I am alone.

Source: A Stranger in Olondria (2013), Chapter 17, “The House of the Horse, My Palace” (p. 248)

Source: A Vindication of the Rights of Woman (1792), Ch. 9

Reported in Josiah Hotchkiss Gilbert, Dictionary of Burning Words of Brilliant Writers (1895), p. 96.

A Poet's Advice (1958)
Context: Almost anybody can learn to think or believe or know, but not a single human being can be taught to feel …
the moment you feel, you're nobody-but-yourself.
To be nobody-but-yourself — in a world which is doing its best, night and day, to make you everybody else — means to fight the hardest battle which any human being can fight; and never stop fighting.