Thomas Jefferson on Philosophy

"I never consider a difference of opinion in politics, in religion, in philosophy, as cause for withdrawing from a friend."

"If there be any among us who wish to dissolve the 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."

"I have no fear that the result of our experiment will be that men may be trusted to govern themselves without a master. Could the contrary of this be proved, I should conclude either that there is no god, or that he is a malevolent being."

"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."

"Ridicule is the only weapon which can be used against unintelligible propositions. Ideas must be distinct before reason can act upon them; and no man ever had a distinct idea of the trinity. It is the mere Abracadabra of the mountebanks calling themselves the priests of Jesus."

"Treasury notes of small as well as high denomination, bottomed on a tax which would redeem them in ten years, would place at our disposal the whole circulating medium of the United States... The public... ought never more to permit its being filched from them by private speculators and disorganizers of the circulation."

"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."

"It has always been denied by the republican party in this country, that the Constitution had given the power of incorporation to Congress. On the establishment of the Bank of the United States, this was the great ground on which that establishment was combated; and the party prevailing supported it only on the argument of its being an incident to the power given them for raising money."

"The religion-builders have so distorted and deformed the doctrines of Jesus, so muffled them in mysticisms, fancies and falsehoods, have caricatured them into forms so monstrous and inconceivable, as to shock reasonable thinkers. … Happy in the prospect of a restoration of primitive Christianity, I must leave to younger athletes to encounter and lop off the false branches which have been engrafted into it by the mythologists of the middle and modern ages."

"Some have made the love of God the foundation of morality. This, too, is but a branch of our moral duties, which are generally divided into duties to God and duties to man. If we did a good act merely from the love of God and a belief that it is pleasing to Him, whence arises the morality of the Atheist? It is idle to say, as some do, that no such being exists. We have the same evidence of the fact as of most of those we act on, to-wit: their own affirmations, and their reasonings in support of them. I have observed, indeed, generally, that while in protestant countries the defections from the Platonic Christianity of the priests is to Deism, in catholic countries they are to Atheism. Diderot, D'Alembert, D'Holbach, Condorcet, are known to have been among the most virtuous of men. Their virtue, then, must have had some other foundation than the love of God."

"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."

"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."

"I thought Congress had taken their ground firmly for continuing their embargo till June, and then war. But a sudden and unaccountable revolution of opinion took place the last week, chiefly among the New England and New York members, and in a kind of panic they voted the 4th of March for removing the embargo, and by such a majority as gave all reason to believe they would not agree either to war or non-intercourse. This, too, was after we had become satisfied that the Essex Junto had found their expectation desperate, of inducing the people there either to separation or forcible opposition. The majority of Congress, however, has now rallied to the removing the embargo on the 4th March, non-intercourse with France and Great Britain, trade everywhere else, and continuing war preparations. The further details are not yet settled, but I believe it is perfectly certain that the embargo will be taken off the 4th of March."

"The extent of our country was so great, and its former division into distinct States so established, that we thought it better to confederate as to foreign affairs only. Every State retained its self-government in domestic matters, as better qualified to direct them to the good and satisfaction of their citizens, than a general government so distant from its remoter citizens, and so little familiar with the local peculiarities of the different parts. There are now twenty-four of these distinct States, none smaller perhaps than your Morea, several larger than all Greece. Each of these has a constitution framed by itself and for itself, but militating in nothing with the powers of the General Government in its appropriate department of war and foreign affairs. These constitutions being in print and in every hand, I shall only make brief observations on them, and on those provisions particularly which have not fulfilled expectations, or which, being varied in different States, leave a choice to be made of that which is best. You will find much good in all of them, and no one which would be approved in all its parts. Such indeed are the different circumstances, prejudices, and habits of different nations, that the constitution of no one would be reconcilable to any other in every point. A judicious selection of the parts of each suitable to any other, is all which prudence should attempt ."

"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."

"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. I am satisfied, and sufficiently occupied with the things which are, without tormenting or troubling myself about those which may indeed be, but of which I have no evidence."

"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."

"Compulsion in religion is distinguished peculiarly from compulsion in every other thing. I may grow rich by art I am compelled to follow, I may recover health by medicines I am compelled to take against my own judgment, but I cannot be saved by a worship I disbelieve & abhor."

"To begin an affair of that kind now, and carry it on so long a time in form, is by no means a proper plan ... whatever assurances I may give her in private of my esteem for her, or whatever assurances I may ask in return from her, depend on it — they must be kept in private. Necessity will oblige me to proceed in a method which is not generally thought fair; that of treating with a ward before obtaining the approbation of her guardian. I say necessity will oblige me to it, because I never can bear to remain in suspense so long a time. If I am to succeed, the sooner I know it, the less uneasiness I shall have to go through. If I am to meet with a disappointment, the sooner I know it, the more of life I shall have to wear it off: and if I do meet with one, I hope in God, and verily believe; it will be the last."