I consider that peace at any price with our fellow-citizens is preferable to civil war.

[Mini enim omnis pax cum civibus, bello civili utilior videbatur.]

Marcus Tullius Cicero (106-43 BC) Roman orator, statesman, philosopher

Philippics [Philippicae; Antonian Orations], No. 2, ch. 15 / sec. 37 (2.15/2.37) (44-10-24 BC) [ed. Harbottle (1906)]
    (Source)

A topic Cicero wrote and spoke about often. See also here and here.

(Source (Latin)). Other translations:

For I conceived that any peace between citizens was more expedient than civil war.
[tr. King (1877)]

For to me any peace with citizens seemed more profitable than civil war.
[tr. Ker (Loeb) (1926)]

For any sort of peace with our fellow-citizens appeared to me more desirable than civil war.
[tr. Yonge (1903)]

So for me any peace that could unite our citizens seemed preferable to a war that tore them apart.
[tr. Grant (1960)]

And I thought any kind of peace with fellow-citizens preferable to civil war.
[tr. Berry (2006)]

For peace with fellow-citizens seemed considerably better to me than civil war.
[tr. McElduff (2011)]