Third Philippic (24)

On the contrary, when you, or rather the Athenians of that day, were thought to be showing a want of consideration in dealing with others, all felt it their duty, even those who had no grievance against them, to go to war in support of those who had been injured; and again, when the Lacedaemonians had risen to power and succeeded to your position of supremacy, and when they set to work to encroach on others and interfered unduly with the established order of things, all the Greeks were up in arms, even those who had no grievance of their own.