“God will see to it that war always recurs as a drastic medicine for the human race.”

1950s, The Russell-Einstein Manifesto (1955)
Context: Here, then, is the problem which we present to you, stark and dreadful and inescapable: Shall we put an end to the human race; or shall mankind renounce war? People will not face this alternative because it is so difficult to abolish war.
The abolition of war will demand distasteful limitations of national sovereignty. But what perhaps impedes understanding of the situation more than anything else is that the term "mankind" feels vague and abstract. People scarcely realize in imagination that the danger is to themselves and their children and their grandchildren, and not only to a dimly apprehended humanity. They can scarcely bring themselves to grasp that they, individually, and those whom they love are in imminent danger of perishing agonizingly. And so they hope that perhaps war may be allowed to continue provided modern weapons are prohibited.
This hope is illusory. Whatever agreements not to use H-bombs had been reached in time of peace, they would no longer be considered binding in time of war, and both sides would set to work to manufacture H-bombs as soon as war broke out, for, if one side manufactured the bombs and the other did not, the side that manufactured them would inevitably be victorious.

The benign catastrophist (2003)

Innkeeper's wife
Source: A Child is Born (1942)
Context: God pity us indeed, for we are human,
And do not always see
The vision when it comes, the shining change,
Or, if we see it, do not follow it,
Because it is too hard, too strange, too new,
Too unbelievable, too difficult,
Warring too much with common, easy ways,
And now I know this, standing in this light,
Who have been half alive these many years,
Brooding on my own sorrow, my own pain,
Saying "I am a barren bough. Expect
Nor fruit nor blossom from a barren bough."

1989

Source: Twenty Trillion Leagues Under the Sea (2014), Chapter 24, “Dakkar” (p. 229)

1900s, The Moral Equivalent of War (1906)
Context: The war-party is assuredly right in affirming and reaffirming that the martial virtues, although originally gained by the race through war, are absolute and permanent human goods. Patriotic pride and ambition in their military form are, after all, only specifications of a more general competitive passion. They are its first form, but that is no reason for supposing them to be its last form. Men are now proud of belonging to a conquering nation, and without a murmur they lay down their persons and their wealth, if by so doing they may fend off subjection. But who can be sure that other aspects of one's country may not, with time and education and suggestion enough, come to be regarded with similarly effective feelings of pride and shame? Why should men not some day feel that is it worth a blood-tax to belong to a collectivity superior in any respect? Why should they not blush with indignant shame if the community that owns them is vile in any way whatsoever? Individuals, daily more numerous, now feel this civic passion. It is only a question of blowing on the spark until the whole population gets incandescent, and on the ruins of the old morals of military honor, a stable system of morals of civic honor builds itself up. What the whole community comes to believe in grasps the individual as in a vise. The war-function has grasped us so far; but the constructive interests may some day seem no less imperative, and impose on the individual a hardly lighter burden.

Source: Grave Peril

1970s-, The Captains, the Kings, and Taylor Caldwell (1978)
Context: You’ve got to look at life clearly. No rose-colored glasses. The human race is not very admirable. It was a big mistake of God’s... The more I see of people, the more bitter I become. I think I appeal to readers because there’s nothing false or hypocritical in what I write. And they recognize themselves, and recognize their fears. And they know what bastards they are.

Source: Following the Equator: A Journey Around the World