“He [Goya] has selected from amongst the innumerable foibles and follies to be found in any civilized society, and from the common prejudices and deceitful practices which custom, ignorance or self-interest have made usual..”

"The Origins and Effects of Our Morals: A Problem for Science", in The Essence of Hayek (1984)
1980s and later

"The Marxian Critique of Justice," Philosophy and Public Affairs, Vol. 1, No. 3 (Spring, 1972), pp. 244-282

Sahih al-Bukhari and Sahih Muslim, as quoted by Ahmed Shendy Yousef in The Brotherhood in Islam, Message to the Jews, Christians and Muslims page 30.
Sunni Hadith

The Zero Marginal Cost Society: The Internet of Things, the Collaborative Commons, and the Eclipse of Capitalism (2014)

Attributed to Clemenceau by Hans Bendix, in "Merry Christmas, America!" The Saturday Review of Literature (1 December 1945), p. 9; this appears to be the earliest reference to such a remark as one by Clemenceau, though earlier, in Frank Lloyd Wright : An Autobiography (1943) there is mention that "A witty Frenchman has said of us: 'The United States of America is the only nation to plunge from barbarism to degeneracy with no culture in between.'" Similar remarks are sometimes attributed without a source to Oscar Wilde and George Bernard Shaw.
Variants:
America is the only nation in history which miraculously has gone directly from barbarism to decadence without the usual interval of civilization.
America is the only country that went from barbarism to decadence without civilisation in between.
Post-Prime Ministerial

"On the Tendency of Sects"
The Round Table (1815-1817)
Context: There is a natural tendency in sects to narrow the mind.
The extreme stress laid upon difierences of minor importance, to the neglect of more general truths and broader views of things, gives an inverted bias to the understanding; and this bias is continually increased by the eagerness of controversy, and captious hostility to the prevailing system. A party-feeling of this kind once formed will insensibly communicate itself to other topics; and will be too apt to lead its votaries to a contempt for the opinions of others, a jealousy of every difference of sentiment, and a disposition to arrogate all sound principle as well as understanding to themselves, and those who think with them. We can readily conceive how such persons, from fixing too high a value on the practical pledge which they have given of the independence and sincerity of their opinions, come at last to entertain a suspicion of every one else as acting under the shackles of prejudice or the mask of hypocrisy. All those who have not given in their unqualified protest against received doctrines and established authority, are supposed to labour under an acknowledged incapacity to form a rational determination on any subject whatever. Any argument, not having the presumption of singularity in its favour, is immediately set aside as nugatory. There is, however, no prejudice so strong as that which arises from a fancied exemption from all prejudice. For this last implies not only the practical conviction that it is right, but the theoretical assumption that it cannot be wrong. From considering all objections as in this manner "null and void,” the mind becomes so thoroughly satisfied with its own conclusions, as to render any farther examination of them superfluous, and confounds its exclusive pretensions to reason with the absolute possession of it.

Jahangir, Tuzuk, I, 150-51. quoted from Lal, K. S. (1994). Muslim slave system in medieval India. New Delhi: Aditya Prakashan. Chapter 9

Introduction; part of this has sometimes been paraphrased : Our civilization has not yet fully recovered from the shock of its birth — the transition from the tribal or 'closed society', with its submission to magical forces, to the 'open society' which sets free the critical powers of man.
The Open Society and Its Enemies (1945)

30. 196-197
Oration on the Dignity of Man (1496)