Thucydides 1.141.6-7 (tr. Benjamin Jowett):
In a single pitched battle the Peloponnesians and their allies are a match for all Hellas, but they are not able to maintain a war against a power different in kind from their own; they have no regular general assembly, and therefore cannot execute their plans with speed and decision. The confederacy is made up of many races; all the representatives have equal votes, and press their several interests. There follows the usual result, that nothing is ever done properly. For some are all anxiety to be revenged on an enemy, while others only want to get off with as little loss as possible. The members of such a confederacy are slow to meet, and when they do meet, they give little time to the consideration of any common interest, and a great deal to schemes which further the interest of their particular state. Every one fancies that his own neglect will do no harm, but that it is somebody else's business to keep a look-out for him, and this idea, cherished alike by each, is the secret ruin of all.