I cannot ask of Heaven success, even for my Country, in a Cause where she should be in the wrong — Fiat Justitia, pereat Coelum — My toast would be, may our Country be always successful, but whether successful or otherwise, always right.

John Quincy Adams (1767-1848) US President (1825-29)

Letter (1816-08-01) to John Adams
    (Source)

In response to Stephen Decatur's toast (1816-04, at a dinner in Norfolk, Virginia): "Our Country! In her intercourse with foreign nations may she always be in the right, but our country, right or wrong." The last part became a common nationalistic slogan.

The Latin translates as "Let justice be done though Heaven should fall."