As for Demades, he had not long enjoyed his growing reputation when vengeance for Demosthenes brought him into Macedonia, whose people he had disgracefully flattered, only to be by them justly put to death. He had been obnoxious to them even before this, but now fell under a charge from which there was no escape. A letter of his, namely, leaked out, in which he had urged Perdiccas to seize Macedonia and deliver the Greeks, who, he said, were fastened to it only by an old and rotten thread (meaning Antipater).
Edition :
Plutarch Lives VII: Demosthenes and Cicero, Alexander and Caesar, Ed. Jeffrey Henderson, trans. Bernadotte Perrin (The Loeb Classical Library 99), Harvard University Press: Cambridge/MA - London 1967 (first ed. 1919).