History of the Peloponnesian War

"For when you called us in to aid you at the first, the fear you pretended was only this: that if we neglected you, the Syracusians would subdue you, and we thereby should participate of the danger.

And it were unjust that the argument you would needs have to prevail then with us should now have no effect with yourselves, or that you should be jealous of the much strength we bring against the power of the Syracusians when much rather you should give the less ear unto them. We cannot so much as stay here without you;

and if becoming perfidious we should subdue these states, yet we are unable to hold them, both in respect of the length of the voyage and for want of means of guarding them, because they be great and provided after the manner of the continent. Whereas they, not lodged near you in a camp, but inhabiting near you in a city of greater power than this of ours, will be always watching their advantages against you;

and when an opportunity shall be offered against any of your cities, will be sure not to let it slip. This they have already made to appear, both in their proceedings against the Leontines, and also otherwise. And yet have these the face to move you against us that hinder this, and that have hitherto kept Sicily from falling into their hands.

But we, on the other side, invite you to a far more real safety, and pray you not to betray that safety which we both of us hold from one another at this present, but to consider that they by their own number have way to you always, though without confederates, whereas you shall seldom have so great an aid again to resist them. Which if through your jealousy you suffer to go away without effect, or if it miscarry, you will hereafter wish for the least part of the same, when their coming can no more do you good.