On the False Embassy
Demosthenes
Demosthenes. Vol. II. De Corona, De Falsa Legatione, XVIII, XIX. Vince, C. A. and Vince, J. H., translators. Cambridge, MA: Harvard University Press, 1926 (1939 reprint).
or, if he refused, we could promptly report his refusal. In that case you, observing his grasping spirit and perfidy in those distant and comparatively unimportant places, would no longer be negligent of the more important concerns that lay nearer home—I mean the Phocians and Thermopylae. If he had not seized the positions, and if there had been no deception of you, all your interests were safe enough, and you would get fair treatment from him without compulsion.
This was a reasonable expectation; for so long as the Phocians were safe, as they were at the time, and in possession of Thermopylae, there was no menace which Philip could have brandished in your face to make you disregard any of your just claims. He could not reach Attica either by a march across country or by getting command of the seas. If he refused justice, you could forthwith close his ports, stop his supply of money, and otherwise reduce him to a state of blockade; and so he, and not you, would be wholly dependent on the contingent benefits of the peace.