“In war, where both success and failure are repaid by death, hostile agents who penetrate into the rear are subject to execution. This is inhuman, but no one ever considered war a school of humanity.”

Interview by Tor Wennerberg, November 1998 http://www.chomsky.info/interviews/199811--.htm.
Quotes 1990s, 1995-1999
Context: No individual gets up and says, I'm going to take this because I want it. He'd say, I'm going to take it because it really belongs to me and it would be better for everyone if I had it. It's true of children fighting over toys. And it's true of governments going to war. Nobody is ever involved in an aggressive war; it's always a defensive war -- on both sides.

Chapter: Helvidius Number IV http://oll.libertyfund.org/?option=com_staticxt&staticfile=show.php%3Ftitle=1910&chapter=112553&layout=html&Itemid=27 in: The Pacificus-Helvidius Debates of 1793-1794: Toward the Completion of the American Founding, edited with and Introduction by Morton J. Frisch (Indianapolis: Liberty Fund, 2007)
Context: In no part of the constitution is more wisdom to be found than in the clause which confides the question of war or peace to the legislature, and not to the executive department. Beside the objection to such a mixture of heterogeneous powers: the trust and the temptation would be too great for any one man: not such as nature may offer as the prodigy of many centuries, but such as may be expected in the ordinary successions of magistracy. War is in fact the true nurse of executive aggrandizement. In war a physical force is to be created, and it is the executive will which is to direct it. In war the public treasures are to be unlocked, and it is the executive hand which is to dispense them. In war the honors and emoluments of office are to be multiplied; and it is the executive patronage under which they are to be enjoyed. It is in war, finally, that laurels are to be gathered, and it is the executive brow they are to encircle. The strongest passions, and most dangerous weaknesses of the human breast; ambition, avarice, vanity, the honorable or venial love of fame, are all in conspiracy against the desire and duty of peace.

The Pathway of Peace (1923)
Context: We may gain something in our quest for peace if we recognize at once that war is not an abnormality. In the truest sense, it is not the mere play of brute force. It is the expression of the insistent human will, inflexible in its purpose.
When we consider the inability to maintain a just peace attests to the failure of civilization itself, we may be less confident of the success of any artificial contrivances to prevent war. We must recognize that we are dealing with the very woof and warp of human nature. The war to end war has left its curse of hate, its lasting injuries, its breeding grounds of strife, and to secure an abiding peace appears to be more difficult than ever. There is no advantage to shutting our eyes to the facts; nor should we turn in disgust of panaceas to the counsel of despair. The pathway of peace is the longest and most beset with obstacles the human race has to tread; the goal may be distant, but we must press on.

Source: Songs of the Soul (1971)
Context: War forgets peace. Peace forgives war. War is the death of the life human. Peace is the birth of the Life Divine. Our vital passions want war. Our psychic emotions desire peace.

The Future of Civilization (1938)

"Resolution on the Antiwar Congress of the London Bureau" (July 1936)

On War (1832), Book 3

2000s, The Real Abraham Lincoln: A Debate (2002), Q&A

Statement about World War II (written in 1943), p. 77
Wars I Have Seen (1945)