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.
So the Athenians detained the ambassadors, as was told them; and Themistocles, having come to an audience of the Lacedaemonians, then indeed told them plainly that their city was already walled, so as to be capable of defending its inhabitants; and if the Lacedaemonians or the allies wished to send any embassy to them, they should in future go as to men who could discern what were their own and the general interests.
For when they thought it better to abandon their city and to go on board their ships, they said that they had made up their minds, and had the courage to do it, without consulting them; and again, on whatever matters they had deliberated with them, they had shown themselves inferior to none in judgment.
And so at the present time, likewise, they thought it was better that their city should have a wall, and that it would be more expedient for their citizens in particular, as well as for the allies in general;
for it was not possible for any one without equal resources to give any equal or fair advice for the common good. Either all therefore, he said, should join the confederacy without walls, or they should consider that the present case also was as it ought to be.
The Lacedaemonians, on hearing this, did not let their anger appear to the Athenians; (for they had not sent their embassy to obstruct their designs, but to offer counsel, they said, to their state; [*]( Or, as the scholiast explains it, for the good of their state; which is adopted by Arnold.) and besides, they were at that time on very friendly terms with them owing to their zeal against the (Mede;) in secret, however, they were annoyed at failing in their wish. So the ambassadors of each state returned home without any complaint being made.
In this way the Athenians walled their city in a short time.