Thucydides,
The History of the Peloponnesian War
“ In a struggle with Peloponnesians and neighbours our strength is of the same character, and it is possible to move swiftly on the different points. But a struggle with a people who live in a distant land, who have also an extraordinary familiarity with the sea, and who are in the highest state of preparation in every other department; with wealth private and public, with ships, and horses, and heavy infantry, and a population such as no one other Hellenic place can equal, and lastly a number of tributary allies—what can justify us in rashly beginning such a struggle? ”
