-- Leonardo Bruni
Samuel Adams: "When once they lose their virtue then [they] will be ready to surrender their liberties"
"A general dissolution of principles and manners will more surely overthrow the liberties of America than the whole force of the common enemy. While the people are virtuous they cannot be subdued; but when once they lose their virtue then will be ready to surrender their liberties to the first external or internal invader."
-- Samuel Adams, letter to James Warren, 1779
"A thing moderately good is not so good as it ought to be. Moderation in temper is always a virtue; but moderation in principle is always a vice."
-- Thomas Paine, 1792
"Republics are created by the virtue, public spirit, and intelligence of the citizens. They fall, when the wise are banished from the public councils, because they dare to be honest, and the profligate are rewarded, because they flatter the people, in order to betray them."
-- Joseph Story, Commentaries on the Constitution, 1833
"Human nature itself is evermore an advocate for liberty. There is also in human nature a resentment of injury, and indignation against wrong. A love of truth and a veneration of virtue. These amiable passions, are the "latent spark"... If the people are capable of understanding, seeing and feeling the differences between true and false, right and wrong, virtue and vice, to what better principle can the friends of mankind apply than to the sense of this difference?"
-- John Adams, the Novanglus, 1775
"(W)hen in the distant future some man, some faction, some interest, should set up the doctrine that none but rich men, or none but white men, or none but Anglo-Saxon white men, were entitled to life, liberty, and the pursuit of happiness, their posterity might look up again to the Declaration of Independence and take courage to renew the battle which their fathers began, so that truth and justice and mercy and all the humane and Christian virtues might not be extinguished from the land; so that no man would hereafter dare to limit and circumscribe the great principles on which the temple of liberty was being built."
-- Abraham Lincoln, August 17, 1858
"He therefore is the truest friend to the liberty of this country who tries most to promote its virtue, and who, so far as his power and influence extend, will not suffer a man to be chosen into any office of power and trust who is not a wise and virtuous man....The sum of all is, if we would most truly enjoy this gift of Heaven, let us become a virtuous people."
-- Samuel Adams