19 Thomas Jefferson Quotes on Reason

Thomas Jefferson quotes on reason

10. Well aware that the opinions and belief of men depend not on their own will, but follow involuntarily the evidence proposed to their minds; that Almighty God hath created the mind free, and manifested his supreme will that free it shall remain by making it altogether insusceptible of restraint; that all attempts to influence it by temporal punishments, or burthens, or by civil incapacitations, tend only to beget habits of hypocrisy and meanness, and are a departure from the plan of the holy author of our religion, who being lord both of body and mind, yet choose not to propagate it by coercions on either, as was in his Almighty power to do, but to exalt it by its influence on reason alone; that the impious presumption of legislature and ruler, civil as well as ecclesiastical, who, being themselves but fallible and uninspired men, have assumed dominion over the faith of others, setting up their own opinions and modes of thinking as the only true and infallible, and as such endeavoring to impose them on others, hath established and maintained false religions over the greatest part of the world and through all time: That to compel a man to furnish contributions of money for the propagation of opinions which he disbelieves and abhors, is sinful and tyrannical; : that our civil rights have no dependence on our religious opinions, any more than our opinions in physics or geometry; and therefore the proscribing any citizen as unworthy the public confidence by laying upon him an incapacity of being called to offices of trust or emolument, unless he profess or renounce this or that religions opinion, is depriving him injudiciously of those privileges and advantages to which, in common with his fellow-citizens, he has a natural right; that it tends also to corrupt the principles of that very religion it is meant to encourage, by bribing with a monopoly of worldly honours and emolumerits, those who will externally profess and conform to it; that though indeed these are criminals who do not withstand such temptation, yet neither are those innocent who lay the bait in their way; that the opinions of men are not the object of civil government, nor under its jurisdiction; that to suffer the civil magistrate to intrude his powers into the field of opinion and to restrain the profession or propagation of principles on supposition of their ill tendency is a dangerous fallacy, which at once destroys all religious liberty, : and finally, that 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.

30. It was by the sober sense of our citizens that we were safely and steadily conducted from monarchy to republicanism, and it is by the same agency alone we can be kept from falling back.

    Attribution disputed; shown as originally published.

78. I am really mortified to be told that, in the United States of America, a fact like this can become a subject of inquiry, and of criminal inquiry too, as an offence against religion; that a question about the sale of a book can be carried before the civil magistrate. Is this then our freedom of religion? and are we to have a censor whose imprimatur shall say what books may be sold, and what we may buy? And who is thus to dogmatize religious opinions for our citizens? Whose foot is to be the measure to which ours are all to be cut or stretched? Is a priest to be our inquisitor, or shall a layman, simple as ourselves, set up his reason as the rule for what we are to read, and what we must believe? It is an insult to our citizens to question whether they are rational beings or not, and blasphemy against religion to suppose it cannot stand the test of truth and reason.

104. As you say of yourself, I too am an Epicurian. I consider the genuine (not the imputed) doctrines of Epicurus as containing everything rational in moral philosophy which Greece and Rome have left us.

110. My aim in that was, to justify the character of Jesus against the fictions of his pseudo-followers, which have exposed him to the inference of being an impostor. For if we could believe that he really countenanced the follies, the falsehoods and the charlatanisms which his biographers father on him, and admit the misconstructions, interpolations and theorizations of the fathers of the early, and fanatics of the latter ages, the conclusion would be irresistible by every sound mind, that he was an impostor. I give no credit to their falsifications of his actions and doctrines, and to rescue his character, the postulate in my letter asked only what is granted in reading every other historian. ... I say, that this free exercise of reason is all I ask for the vindication of the character of Jesus. We find in the writings of his biographers matter of two distinct descriptions. First, a groundwork of vulgar ignorance, of things impossible, of superstitions, fanaticisms and fabrications. Intermixed with these, again, are sublime ideas of the Supreme Being, aphorisms and precepts of the purest morality and benevolence, sanctioned by a life of humility, innocence and simplicity of manners, neglect of riches, absence of worldly ambition and honors, with an eloquence and persuasiveness which have not been surpassed. These could not be inventions of the groveling authors who relate them. They are far beyond the powers of their feeble minds. They shew that there was a character, the subject of their history, whose splendid conceptions were above all suspicion of being interpolations from their hands. Can we be at a loss in separating such materials, and ascribing each to its genuine author? The difference is obvious to the eye and to the understanding, and we may read as we run to each his part; and I will venture to affirm, that he who, as I have done, will undertake to winnow this grain from its chaff, will find it not to require a moment's consideration. The parts fall asunder of themselves, as would those of an image of metal and clay. ... There are, I acknowledge, passages not free from objection, which we may, with probability, ascribe to Jesus himself; but claiming indulgence from the circumstances under which he acted. His object was the reformation of some articles in the religion of the Jews, as taught by Moses. That sect had presented for the object of their worship, a being of terrific character, cruel, vindictive, capricious and unjust. Jesus, taking for his type the best qualities of the human head and heart, wisdom, justice, goodness, and adding to them power, ascribed all of these, but in infinite perfection, to the Supreme Being, and formed him really worthy of their adoration. Moses had either not believed in a future state of existence, or had not thought it essential to be explicitly taught to his people. Jesus inculcated that doctrine with emphasis and precision. Moses had bound the Jews to many idle ceremonies, mummeries and observances, of no effect towards producing the social utilities which constitute the essence of virtue; Jesus exposed their futility and insignificance. The one instilled into his people the most anti-social spirit towards other nations; the other preached philanthropy and universal charity and benevolence. The office of reformer of the superstitions of a nation, is ever dangerous. Jesus had to walk on the perilous confines of reason and religion: and a step to right or left might place him within the gripe of the priests of the superstition, a blood thirsty race, as cruel and remorseless as the being whom they represented as the family God of Abraham, of Isaac and of Jacob, and the local God of Israel. They were constantly laying snares, too, to entangle him in the web of the law. He was justifiable, therefore, in avoiding these by evasions, by sophisms, by misconstructions and misapplications of scraps of the prophets, and in defending himself with these their own weapons, as sufficient, ad homines, at least. That Jesus did not mean to impose himself on mankind as the son of God, physically speaking, I have been convinced by the writings of men more learned than myself in that lore. But that he might conscientiously believe himself inspired from above, is very possible.

111. To talk of immaterial existences is to talk of nothings. To say that the human soul, angels, god, are immaterial, is to say they are nothings, or that there is no god, no angels, no soul. I cannot reason otherwise: but I believe I am supported in my creed of materialism by Locke, Tracy, and Stewart. At what age of the Christian church this heresy of immaterialism, this masked atheism, crept in, I do not know. But heresy it certainly is.

114. We are not afraid to follow truth wherever it may lead, nor to tolerate any error so long as reason is left free to combat it.

122. They might need a preparatory discourse on the text of 'prove all things, hold fast that which is good,' in order to unlearn the lesson that reason is an unlawful guide in religion. They might startle on being first awaked from the dreams of the night, but they would rub their eyes at once, and look the spectres boldly in the face.

124. No historical fact is better established, than that the doctrine of one God, pure and uncompounded, was that of the early ages of Christianity : Nor was the unity of the Supreme Being ousted from the Christian creed by the force of reason, but by the sword of civil government, wielded at the will of the fanatic Athanasius. The hocus-pocus phantasm of a God like another Cerberus, with one body and three heads, had its birth and growth in the blood of thousands of martyrs : The Athanasian paradox that one is three, and three but one, is so incomprehensible to the human mind, that no candid man can say he has any idea of it, and how can he believe what presents no idea? He who thinks he does, only deceives himself. He proves, also, that man, once surrendering his reason, has no remaining guard against absurdities the most monstrous, and like a ship without rudder, is the sport of every wind. With such person, gullibility which they call faith, takes the helm from the hand of reason, and the mind becomes a wreck.

125. I can never join Calvin in addressing his god. He was indeed an Atheist, which I can never be; or rather his religion was Daemonism. If ever man worshipped a false god, he did. The being described in his 5 points is not the God whom you and I acknowledge and adore, the Creator and benevolent governor of the world; but a daemon of malignant spirit. It would be more pardonable to believe in no god at all, than to blaspheme him by the atrocious attributes of Calvin. Indeed I think that every Christian sect gives a great handle to Atheism by their general dogma that, without a revelation, there would not be sufficient proof of the being of a god.

126. The truth is, that the greatest enemies of the doctrine of Jesus are those, calling themselves the expositors of them, who have perverted them to the structure of a system of fancy absolutely incomprehensible, and without any foundation in his genuine words. And the day will come when the mystical generation of Jesus, by the supreme being as his father in the womb of a virgin will be classed with the fable of the generation of Minerva in the brain of Jupiter : But may we hope that the dawn of reason and freedom of thought in these United States will do away with this artificial scaffolding, and restore to us the primitive and genuine doctrines of this most venerated reformer of human errors.

131. It is between fifty and sixty years since I read it, and I then considered it merely the ravings of a maniac, no more worthy nor capable of explanation than the incoherences of our own nightly dreams. : what has no meaning admits no explanation.

144. The moral sense, or conscience, is as much a part of man as his leg or arm. It is given to all human beings in a stronger or weaker degree, as force of members is given them in a greater or less degree. It may be strengthened by exercise, as may any particular limb of the body. This sense is submitted, indeed, in some degree, to the guidance of reason; but it is a small stock which is required for this: even a less one than what we call common sense. State a moral case to a ploughman and a professor. The former will decide it as well, and often better than the latter, because he has not been led astray by artificial rules.

146. Your reason is now mature enough to examine this object [religion]. In the first place divest yourself of all bias in favour of novelty & singularity of opinion. Indulge them in any other subject rather than that of religion. It is too important, & the consequences of error may be too serious. On the other hand shake off all the fears & servile prejudices under which weak minds are servilely crouched. Fix reason firmly in her seat, and call to her tribunal every fact, every opinion. Question with boldness even the existence of a god; because, if there be one, he must more approve the homage of reason, than that of blindfolded fear. Scan of the original page at The Library of Congress.

149. You will next read the new testament. It is the history of a personage called Jesus. Keep in your eye the opposite pretensions I. of those who say he was begotten by god, born of a virgin, suspended & reversed the laws of nature at will, & ascended bodily into heaven: and 2. of those who say he was a man of illegitimate birth, of a benevolent heart, enthusiastic mind, who set out without pretensions to divinity, ended in believing them, & was Punished capitally for sedition by being gibbeted according to the Roman law which punished the first commission of that offence by whipping, & the second by exile or death in furca.

150. Do not be frightened from this inquiry by any fear of its consequences. If it ends in a belief that there is no god, you will find incitements to virtue in the comfort and pleasantness you feel in its exercise, and the love of others which it will procure you. If you find reason to believe there is a God, a consciousness that you are acting under his eye, and that he approves you, will be a vast additional incitement; if that there be a future state, the hope of a happy existence in that increases the appetite to deserve it; if that Jesus was also a god, you will be comforted by a belief of his aid and love.

151. In fine, I repeat, you must lay aside all prejudice on both sides, and neither believe nor reject anything, because any other persons, or description of persons, have rejected or believed it. Your own reason is the only oracle given you by heaven, and you are answerable, not for the rightness, but uprightness of the decision.

152. [W]hen speaking of the new testament that you should read all the histories of Christ, as well of those whom a council of ecclesiastics have decided for us to be Pseudo-evangelists, as those they named Evangelists. Because these Pseudo-evangelists pretended to inspiration as much as the others, and you are to judge their pretensions by your own reason, & not by the reason of those ecclesiastics. Most of these are lost. There are some however still extant, collected by Fabricius which I will endeavor to get & send you.

153. We are all Republicans - we are all Federalists. If there be any among us who would wish to dissolve this Union or to change its republican form, let them stand undisturbed as monuments of the safety with which error of opinion may be tolerated where reason is left free to combat it.