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).
I take it he was perfectly well aware that now, with Thessaly at variance with him—the Pheraeans, for example, refusing to join his following—with the Thebans getting the worst of the war, defeated in an engagement, and a trophy erected at their expense, he would be unable to force the passage if you sent troops to Thermopylae, and that he could not even make the attempt without serious loss unless he should also resort to some trickery. How, then, he thought, shall I escape open falsehood, and attain all my objects without incurring the charge of perjury? Only if I can find Athenians to hood-wink the Athenian people, for then I shall have no share in the ensuing dishonor.
Accordingly his envoys warned you that he would not accept the Phocian alliance, but then Aeschines and his friends, taking up the tale, assured the people that, although for the sake of the Thebans and the Thessalians Philip could not with decency accept the alliance, yet if he should become master of the situation, and get his peace, he would thereafter do exactly what we should now ask him to agree to.