“You may have the worst timing since Napoleon decided the dead of winter was the right moment to invade Russia.”

Interview with The Morning Hustle, as quoted in The Daily Mail (2 March 2022) https://www.dailymail.co.uk/news/article-10566331/Ukraine-country-Europe-Kamala-explains-Putins-invasion-laymens-terms.html
2022, March 2022

Quoted in A. J. Sylvester's diary entry (26 November 1941), Colin Cross (ed.), Life with Lloyd George. The Diary of A. J. Sylvester 1931-45 (London: Macmillan, 1975), pp. 296-298
Later life

translation from original Dutch: Fons Heijnsbroek
(original Dutch, citaat van Schelfhout, uit zijn brief:) ..en daar wij nu in het Zomer leeven zijn heb ik geen truk [truc] van mij de Winter zoo danig voor den geest te halen dat ik in staat zoude zijn er een te kunnen schilderen.. ..en gij zou den gedult moeten nemen tot aanstaande winter.
Quote of Schelfhout in a letter to his client nl:Johannes Immerzeel, June 1832; as cited in 'Andreas Schelfhout Onsterfelijk schoon', Simonis & Buunk 2005 https://www.simonis-buunk.nl/wp-content/uploads/2016/06/catalogus_schelfhout.pdf, p. 17

The Canton, Ohio Speech, Anti-War Speech (1918)
Context: Wars throughout history have been waged for conquest and plunder. In the Middle Ages when the feudal lords who inhabited the castles whose towers may still be seen along the Rhine concluded to enlarge their domains, to increase their power, their prestige and their wealth they declared war upon one another. But they themselves did not go to war any more than the modern feudal lords, the barons of Wall Street go to war. The feudal barons of the Middle Ages, the economic predecessors of the capitalists of our day, declared all wars. And their miserable serfs fought all the battles. The poor, ignorant serfs had been taught to revere their masters; to believe that when their masters declared war upon one another, it was their patriotic duty to fall upon one another and to cut one another's throats for the profit and glory of the lords and barons who held them in contempt. And that is war in a nutshell. The master class has always declared the wars; the subject class has always fought the battles. The master class has had all to gain and nothing to lose, while the subject class has had nothing to gain and all to lose — especially their lives.
They have always taught and trained you to believe it to be your patriotic duty to go to war and to have yourselves slaughtered at their command. But in all the history of the world you, the people, have never had a voice in declaring war, and strange as it certainly appears, no war by any nation in any age has ever been declared by the people.
And here let me emphasize the fact — and it cannot be repeated too often — that the working class who fight all the battles, the working class who make the supreme sacrifices, the working class who freely shed their blood and furnish the corpses, have never yet had a voice in either declaring war or making peace. It is the ruling class that invariably does both. They alone declare war and they alone make peace.
Yours not to reason why;
Yours but to do and die.
That is their motto and we object on the part of the awakening workers of this nation.
If war is right let it be declared by the people. You who have your lives to lose, you certainly above all others have the right to decide the momentous issue of war or peace.

"Philosophy and Fate", a translation of his inaugural address as chair of Professor of Philosophy at the University of Frankfort on the Main (June 1929)
The Protestant Era (1948)
Context: As Hegel called the place at the end of philosophy the "place of truth," so Marx thought that the proletariat occupies this favored position, and the psychoanalyst attributes it to the completely analyzed personality, and the philosopher of vitalism to the strongest life, to the process of growth, to an élite or a race. There are, according to these ideas, favored moments and positions in history when truth appears and reason is united with the irrational. There are moments, as I myself have emphasized on different occasions, in which "kairos," the right time, is united with "logos," the "eternal truth," and in which the fate of philosophy is decided for a special period.

Socialism (1922), Epilogue (1947)
Context: It is, they say, not Russia that plans aggression but, on the contrary, the decaying capitalist democracies. Russia wants merely to defend its own independence. This is an old and well-tried method of justifying aggression. Louis XIV and Napoleon I, Wilhelm II and Hitler were the most peace-loving of all men. When they invaded foreign countries, they did so only in just self-defence. Russia was as much menaced by Estonia or Latvia as Germany was by Luxemburg or Denmark.

John Rivers in The Genius and the Goddess (1955)
Context: You can't worship a spirit in spirit, unless you do it now. Wallowing in the past may be good literature. As wisdom, it's hopeless. Time Regained is Paradise Lost, and Time Lost is Paradise Regained. Let the dead bury their dead. If you want to live at every moment as it presents itself, you've got to die to every other moment.

As quoted in the essay "To Albert Einstein's Seventieth Birthday" by Arnold Sommerfeld, Albert Einstein : Philosopher-Scientist http://www.worldcat.org/title/albert-einstein-philosopher-scientist/oclc/311439 (1949) edited by Paul A. Schilpp (p. 102). The essay, originally published as "Zum Siebzigsten Geburtstag Albert Einsteins" in Deutsche Beiträge (Eine Zweimonatsschrift) http://www.worldcat.org/title/deutsche-beitrage-eine-zweimonatsschrift/oclc/183334232 Vol. III, No 2, 1949, was translated specifically for the book by Schilpp.
1940s
Variant: Since others have explained my theory, I can no longer understand it myself.

The Art of Measurement (1525).