Plutarch De gloria Atheniensium 1

[1] These things he rightly spoke to the commanders that accompanied him, to whom he opened the way for future performances, while he expelled the barbarians and restored Greece to her ancient liberty. And the same thing may be said to those that magnify themselves for their writings. For if there were none to act, there would be none to write. Take away the political government of Pericles, and the naval trophies of Phormio at Rhium, and the brave achievements of Nicias at Cythera, Megara, and Corinth, Demosthenes’s Pylos, and the four hundred captives taken by Cleon, Tolmides sailing round the Peloponnesus, and Myronidas vanquishing the Boeotians at Oenophyta: and you murder Thucydides. Take away the daring braveries of Alcibiades in the Hellespont, and of Thrasyllus near Lesbos; the dissolution of the oligarchy by Theramenes; Thrasybulus, Archippus, and the seventy that from Phylae ventured to attack the Lacedaemonian tyranny; and Conon again enforcing Athens to take the sea: and then there is an end of Cratippus. For as for Xenophon, he was his own historian, relating the exploits of the army under his command, but saying that Themistogenes the Syracusan had written the history of them; dedicating the honor of his writing to another, that writing of himself as of another, he might gain the more credit. But all the other historians, as the Clinodemi, Diyli, Philochorus, Philarchus, were but the actors of other men’s deeds, as of so many plays, while they compiled the acts of kings and great generals, and thrusting themselves into the memory of their fame, partake of a kind of lustre and light from them. For there is a certain shadow of glory which reflects from those that act to those that write, while the actions of another appear in the discourse as in a mirror.