History of the Peloponnesian War

Neither suffer yourselves to be drawn on by the greatness of the navy which now shall be at your service by this league. For to do no injury to our equals is a firmer power than that addition of strength which, puffed up with present shows, men are to acquire with danger.

And since we be come to this, which once before we said at Lacedaemon, that everyone ought to proceed as he shall think good against his own confederates, we claim that liberty now of you; and that you that have been helped by our votes will not hurt us now by yours, but render like for like;

remembering that now is that occasion wherein he that aideth us is our greatest friend, and he that opposeth us our greatest enemy; and that you will not receive these Corcyraeans into league against our wills nor defend them in their injuries.