“Their peace and their war
Are like wind and storm.War grows from their peace.”
"Those at the top say: peace and war" [Die Oberen sagen: Friede und Krieg] from "A German War Primer" [Deutsche Kriegsfibel] (1937), trans. Lee Baxendall in Poems, 1913-1956, p. 288
Poems, 1913-1956 (1976)
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Bertolt Brecht 102
German poet, playwright, theatre director 1898–1956Related quotes

“In peace, prepare for war. In war, prepare for peace.”
Sometimes erroneously prepended to the opening line "The art of war is of vital importance to the State", but appears to be a variation of the Roman motto "Si vis pacem, para bellum". It's not clear who first misattributed this phrase to Sun Tzu. The earliest appearance of the phrase in Google Books is 1920, when it appeared in a pharmaceutical journal, but no attribution was given then.
Misattributed

A Song of Defeat (1910)

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.

A remark to his private secretary, Lord Sandon, in May 1919. From Terence H. O'Brien, Milner, Viscount Milner of St James and Cape Town 1954-1925, 1979, Constable, p. 335.

“War is only a cowardly escape from the problems of peace.”
As quoted in This I Believe (1954), by Edward R. Murrow, p. 16
Variant: War is only a cowardly escape from the problems of peace.
Source: This I Believe: The Personal Philosophies of One Hundred Thoughtful Men and Women

1963, American University speech
Context: I have, therefore, chosen this time and this place to discuss a topic on which ignorance too often abounds and the truth is too rarely perceived — yet it is the most important topic on earth: world peace. What kind of peace do I mean? What kind of peace do we seek? Not a Pax Americana enforced on the world by American weapons of war. Not the peace of the grave or the security of the slave. I am talking about genuine peace, the kind of peace that makes life on earth worth living, the kind that enables men and nations to grow and to hope and to build a better life for their children — not merely peace for Americans but peace for all men and women — not merely peace in our time but peace for all time.

Priests are “first and foremost bridge builders”: Nigerian-born Permanent Observer to UN https://www.aciafrica.org/news/5470/priests-are-first-and-foremost-bridge-builders-nigerian-born-permanent-observer-to-un (18 March 2022)