Since I was a youngster my favorite ancient was Marcus Tullius Cicero. His advocacy of freedom helped lay the foundation for what is best about the us today, and what is now most vulnerable.
"A nation can survive its fools, and even the ambitious. But it cannot survive treason from within.
An enemy at the gates is less formidable, for he is known and carries his banner openly. But the traitor moves amongst those within the gate freely, his sly whispers rustling through all the alleys, heard in the very halls of government itself.
For the traitor appears not a traitor; he speaks in accents familiar to his victims, and he wears their face and their arguments, he appeals to the baseness that lies deep in the hearts of all men.
He rots the soul of a nation, he works secretly and unknown in the night to undermine the pillars of the city, he infects the body politic so that it can no longer resist. A murder is less to fear."
- Marcus Tullius Cicero (106-43 B.C.) Roman Statesman, philosopher, and Orator