On the False Embassy

For if he should accept the Phocians as allies, and with your help take the oath of friendship to them, he must at once violate the oaths he had already sworn to the Thessalians and the Thebans, with the latter of whom he had covenanted to help them in the subjugation of Boeotia, and with the former to restore their rights at the Amphictyonic Council. If, on the other hand, he was loth to accept them—and in fact the prospect did not please him—he expected that you would send troops to Thermopylae to stop his passage, as indeed you would have done if you had not been outwitted. In that event, he calculated that he would be unable to get through.

He did not need any information from others to reach that conclusion. He was himself a sufficient witness, for, after his first defeat of the Phocians and the overthrow of their leader and commander Onomarchus, although no one in the whole world, Greek or barbarian, sent aid to them save you alone, so far from getting through Thermopylae, or accomplishing any of the purposes of the passage, he had been unable even to approach the pass.