History of the Peloponnesian War

Now when they were ready to join, the commanders made their hortatives, every one to those that were under his own command. To the Mantineans it was said that they were to fight for their territory, and concerning their liberty and servitude; that the former might not be taken from them, and that they might not again taste of the latter. The Argives were admonished that whereas anciently they had the leading of Peloponnesus, and in it an equal share, they should not now suffer themselves to be deprived of it for ever; and that withal, they should now revenge the many injuries of a city, their neighbour and enemy. To the Athenians, it was remembered how honourable a thing it would be for them, in company of so many and good confederates, to be inferior to none of them; and that if they had once vanquished the Lacedaemonians in Peloponnesus, their own dominion would become both the more assured and the larger by it; and that no other would invade their territory hereafter.

Thus much was said to the Argives and their confederates. But the Lacedaemonians encouraged one another both of themselves and also by the manner of their discipline in the war, taking encouragement, being valiant men, by the commemoration of what they already knew; as being well acquainted that a long actual experience conferred more to their safety than any short verbal exhortation, though never so well delivered.