“Reason and free inquiry are the only effectual agents against error.”

“If the American people ever allow private banks to control the issue of their currency first by inflation then by deflation the banks and corporations that will grow up around them will deprive the people of all property until their children wake up homeless on the continent their Fathers conquered... I believe that banking institutions are more dangerous to our liberties than standing armies... The issuing power should be taken from the banks and restored to the people to whom it properly belongs.”

“While the art of printing is left to us science can never be retrograde; what is once acquired of real knowledge can never be lost.”

“How much pain they have cost us, the evils which have never happened. --”

“The art of life is the art of avoiding pain; and he is the best pilot, who steers clearest of the rocks and shoals with which it is beset.”

“So inscrutable is the arrangement of causes and consequences in this world, that a two-penny duty on tea, unjustly imposed in a sequestered part of it, changes the condition of all its inhabitants.”

“In matters of principal stand like a rock.”

“I find that the harder I work, the more luck I seem to have.”

“Some men look at constitutions with sanctimonious reverence, and deem them like the ark of the covenant, too sacred to be touched. They ascribe to the men of the preceding age a wisdom more than human, and suppose what they did to be beyond amendment. I knew that age well; I belonged to it, and labored with it. It deserved well of its country. It was very like the present, but without the experience of the present; and forty years of experience in government is worth a century of book-reading; and this they would say themselves, were they to rise from the dead. I am certainly not an advocate for frequent and untried changes in laws and constitutions. I think moderate imperfections had better be borne with; because, when once known, we accommodate ourselves to them, and find practical means of correcting their ill effects. But I know also, that laws and institutions must go hand in hand with the progress of the human mind. As that becomes more developed, more enlightened, as new discoveries are made, new truths disclosed, and manners and opinions change with the change of circumstances, institutions must advance also, and keep pace with the times. We might as well require a man to wear still the coat which fitted him when a boy, as civilized society to remain ever under the regimen of their barbarous ancestors.” 

“Truth is great and will prevail if left to herself, that she is the proper and sufficient antagonist to error, and has nothing to fear from the conflict, unless by human interposition disarmed of her natural weapons, free argument and debate; errors ceasing to be dangerous when it is permitted freely to contradict them.”

“The will of the people is the only legitimate foundation of any government, and to protect its free expression should be our first object.” 

“Happiness is not being pained in body or troubled in mind.”

“The greatest service which can be rendered any country is to add a useful plant to its culture.

“If our house be on fire, without inquiring whether it was fired from within or without, we must try to extinguish it.”

“We have no right to prejudice another in his civil enjoyments because he is of another church.”