On the Chersonese (40-41)

and, I will add, to every man in the city, even to those who imagine that they stand highest in his good graces. If they doubt it, let them look at Euthycrates and Lasthenes, the Olynthians, who thought they were such bosom-friends of his, and then, when they had betrayed their city, met the most ignominious fate of all. The chief object, however, of his arms and his diplomacy is our free constitution; on nothing in the world is he more bent than on its destruction.

And it is in a way natural that he should act thus. For he knows for certain that even if he masters all else, his power will be precarious as long as you remain a democracy; but if ever he meets with one of the many mischances to which mankind is liable, all the forces that are now under restraint will be attracted to your side.