History of the Peloponnesian War

This profit is the revenue they have from the confederates, which, if they subdue us, will still be greater. For neither will any other revolt; and all that is ours will accrue unto them, and we shall be worse handled besides than those that were under them before.

But aiding us with diligence, you shall both add to your league a city that hath a great navy, the thing you most stand in need of, and also easily overthrow the Athenians by subduction of their confederates because everyone will then be more confident to come in, and you shall avoid the imputation of not assisting such as revolt unto you. And if it appear that your endeavour is to make them free, your strength in this war will be much the more confirmed.