History of the Peloponnesian War
Thucydides
Thucydides. The history of the Peloponnesian War, Volume 1-2. Dale, Henry, translator. London: Heinemann and Henry G. Bohn, 1851-1852.
And others came forward and severally made their complaints, and especially the Megareans, who urged no few other grounds of quarrel, but most of all their being excluded from the ports in the Athenian dominions, and from the Attic market, contrary to the treaty.
And the Corinthians came forward last, after permitting the others first to exasperate the Lacedaemonians; and they spoke after them as follows.
"The trustiness of your policy and intercourse amongst yourselves, Lacedaemonians, renders you the more distrustful with regard to others, if we say any thing [against them]; and from this you have a character for sober-mindedness, but betray too great ignorance with regard to foreign affairs.