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.

But even when they had suffered in Sicily the loss of other forces, and of the greater part of their fleet, and were now involved in sedition at home, they nevertheless held out three years, both against their former enemies, and those from Sicily with them, and moreover against the greater part of their allies who had revolted, and Cyrus, the king's son, who afterwards joined them, and who supplied the Peloponnesians with money for their fleet: nor did they succumb, before they were overthrown and ruined by themselves, through their private quarrels.

Such a superabundance of means had Pericles at that time, by which he himself foresaw that with the greatest ease he could gain the advantage in the war over the Peloponnesians by themselves.