Brian Strauss, The Battle of Salamis (Simon & Schuster, 2004) p. 13
Full quote:
Themistocles was brilliant, farsighted, creative, tireless, magnanimous, courageous, and eloquent. Yet it as also true that during the course of his career he lied, cheated, blustered, and threatened; grabbed credit for others' ideas; manipulated religion; took bribes and extorted protection money; served up insults and pursued vendetta; and ended his days in exile, a traitor. In short, Themistocles was no angel, but seraphim could not have saved the Greeks.