"Six mistakes mankind keeps making century after century: Believing that personal gain is made by crushing others; Worrying about things that cannot be changed or corrected; Insisting that a thing is impossible because we cannot accomplish it; Refusing to set aside trivial preferences; Neglecting development and refinement of the mind; Attempting to compel others to believe and live as we do."
"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."
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Source: Speaking to the Roman Senate, as recorded by Sallust in The Catiline War (c. 40 b.c.). This quotation is a favorite of CIA counterintelligence officers.
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More quotes by Marcus Tullius Cicero
"Do not blame Caesar, blame the people of Rome who have so enthusiastically acclaimed and adored him and rejoiced in their loss of freedom and danced in his path and gave him triumphal processions. Blame the people who hail him when he speaks in the Forum of the 'new, wonderful good society' which shall now be Rome, interpreted to mean 'more money, more ease, more security, more living fatly at the expense of the industrious.'"
"Politicians are not born; they are excreted."
"Though liberty is established by law, we must be vigilant, for liberty to enslave us is always present under that very liberty. Our Constitution speaks of the "general welfare of the people." Under that phrase all sorts of excesses can be employed by lusting tyrants to make us bondsmen."
"A nation can survive its fools, even the ambitious. But it cannot survive treason from within....for the traitor appears not to be a traitor...he rots the soul of a nation...he infects the body politic so that it can no longer resist."
"Poor is the nation that has no heroes, but poorer still is the nation that having heroes, fails to remember and honor them."