Agesilaus (7.6-7.7)

And when the Corinthian exiles told him that the city was about to be surrendered to them and pointed to the engines with which they were confident of taking the walls, he would not make an assault, declaring that Greek cities ought not to be enslaved, but chastened.

he added,

Or again, if it is honourable to hate the Persian because in old days he set out to enslave Greece, and now allies himself with that side which offers him the prospect of working the greater mischief, makes gifts to those who, as he believes, will injure the Greeks most in return, negotiates the peace that he thinks most certain to produce war among us — well, everyone can see these things, but who except Agesilaus has ever striven either to bring about the revolt of a tribe from the Persian, or to save a revolting tribe from destruction, or by some means or other to involve the Great King in trouble so that he will be unable to annoy the Greeks? Nay, when his fatherland was actually at war with Greeks, he did not neglect the common good of Greece, but went out with a fleet to do what harm he could to the barbarian.