“We shall have a harder Christmas than we have known since the war.”

Source: Rigante series, Stormrider, Ch. 17

I Think I'll Sit This One Out (1939)
Context: It is a sensible military tactic to recognize the enemy before you shoot. The common enemy is the animality in man, and not the men here and there who are behaving like animals at the moment. Neither science nor prayer nor force will save us. What will save us is the reason that enables men, in ancient Israel and modern America, to choose between guns and butter, and to choose well. When we have produced men of reason, we shall have a world of reason, and the Hitlers will disappear. As long as we produce men of force we shall have a world of force, and the Hitlers, whoever wins the wars, will carry the day.
Society may make many demands on me, as long as it keeps me out of the cave. It may take my property. It may take my life. But when it puts me back into the cave I must say, politely but firmly, to hell with society. My ancestors were cannibals without benefit of parliaments.

1940s, Victory broadcast (1945)
Context: We have known the bitterness of defeat and the exultation of triumph, and from both we have learned there can be no turning back. We must go forward to preserve in peace what we won in war.
A new era is upon us. Even the lesson of victory itself brings with it profound concern, both for our future security and the survival of civilization. The destructiveness of the war potential, through progressive advances in scientific discovery, has in fact now reached a point which revises the traditional concepts of war.

Source: 2010s, 2013, Things That Matter: Three Decades of Passions, Pastimes and Politics (2013), Chapter 14 : The Age of Holy Terror, "September 11, 2001"
"To War, Not to Court" in The Washington Post (12 September 2001) https://www.washingtonpost.com/archive/opinions/2001/09/12/to-war-not-to-court/86d5f7a6-b901-4a70-93be-01e718471169<!-- also "This is Not Crime, This is War" http://townhall.com/columnists/charleskrauthammer/2001/09/12/this_is_not_crime,_this_is_war -->
Context: We no longer have to search for a name for the post-Cold War era. It will henceforth be known as the age of terrorism. Organized terror has shown what it can do; execute the single greatest massacre in American history, shut down the greatest power on the globe and send its leaders into underground shelters. All this, without even resorting to chemical, biological or nuclear weapons of mass destruction. This is a formidable enemy. To dismiss it as a bunch of cowards perpetrating senseless acts of violence is complacent nonsense. People willing to kill thousands of innocents while they kill themselves are not cowards. They are deadly, vicious warriors and need to be treated as such. Nor are their acts of violence senseless. They have a very specific aim: to avenge alleged historical wrongs and to bring the great American satan to its knees.

interviewed regarding American Atheists' Jersey City, New Jersey "You Know It's a Myth" billboard.

1940s, Fourth Inaugural Address (1945)

Conclusion
1880s, Personal Memoirs of General U. S. Grant (1885)

Lincoln Hall Speech (1879)
Context: Whenever the white man treats the Indian as they treat each other then we shall have no more wars. We shall be all alike — brothers of one father and mother, with one sky above us and one country around us and one government for all. Then the Great Spirit Chief who rules above will smile upon this land and send rain to wash out the bloody spots made by brothers' hands upon the face of the earth. For this time the Indian race is waiting and praying. I hope no more groans of wounded men and women will ever go to the ear of the Great Spirit Chief above, and that all people may be one people.

Presidential campaign (April 12, 2015 – 2016), Speech about the Orlando Shooting (June 13, 2016)