“As for me, I cease not to advocate peace. It may be on unjust terms, but even so it is more expedient than the justest of civil wars.”
Epistulae ad Atticum (Letters to Atticus) Book VII, Letter 14, section 3; as translated by E.O. Winstedt in the Loeb Classical Library http://archive.org/stream/letterstoatticus02ciceuoft#page/68/mode/2up
Original
Equidem ad pacem hortari non desino; quae vel iniusta utilior est quam iustissimum bellum cum civibus.
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Marcus Tullius Cicero 180
Roman philosopher and statesman -106–-43 BCRelated quotes

“This may not be a just peace, but it is more just than the continuation of war.”
Quoted on BBC News http://news.bbc.co.uk/onthisday/hi/dates/stories/november/21/newsid_2549000/2549809.stm

“There is neither a foreign war nor a civil war; there is only just and unjust war.”
Source: Les Misérables

“War doesn't negate decency. It demands it, even more than in times of peace.”
Baba (115)
Source: The Kite Runner (2003)

Source: The Exposition of 1851: Views Of The Industry, The Science, and the Government Of England, 1851, p. xii-xiii; Cited in: Samuel Smiles Industrial biography; iron-workers and tool-makers http://books.google.com/books?id=5trBcaXuazgC&pg=PA104, (1864) p. 104

A Song of Defeat (1910)

Source: 1910s, Theodore Roosevelt — An Autobiography (1913), Ch. VII : The War of American and the Unready
Source: Last and First Men (1930), Chapter III: America and China; Section 2, “The Conflict” (p. 50)