“Can the philosopher, big with the inspiration of an idea that is to reform mankind, believe that he is to be beckoned from this sensible existence at the very instant when he is mustering his breath to speak the word of light? Should he perish so, the weary ages must pass away—the world's, whose life sand may fall, drop by drop—before another intellect is prepared to develop the truth that might have been uttered then. But history affords many an example where the most precious spirit… has gone hence… The prophet dies, and the man of torpid heart and sluggish brain lives on. The poet leaves his song half sung, or finishes it, beyond the scope of mortal ears… The painter—as Allston did—leaves half his conception on the canvas to sadden us with its imperfect beauty, and goes to picture forth the whole… in the hues of heaven. But rather such incomplete designs of life will be perfected nowhere. This so frequent abortion of man's dearest projects must be taken as proof that the deeds of earth, however etherealized by piety or genius, are without value, except as exercises and manifestations of the spirit.”

The Enemy, Ch. 1 (2004).

Letter II
The Nemesis of Faith (1849)

The Ethics of Belief (1877), The Limits Of Inference
Context: p>We may believe what goes beyond our experience, only when it is inferred from that experience by the assumption that what we do not know is like what we know. We may believe the statement of another person, when there is reasonable ground for supposing that he knows the matter of which he speaks, and that he is speaking the truth so far as he knows it.It is wrong in all cases to believe on insufficient evidence; and where it is presumption to doubt and to investigate, there it is worse than presumption to believe.</p

Source: Making Mondragón, 1965, p. 170; As cited in: Ickis (2014)

Source: The Boys Of Summer, Lines On The Transpontine Madness, p. xx

God and the State (1871; publ. 1882)
Context: A person is strong only when he stands upon his own truth, when he speaks and acts from his deepest convictions. Then, whatever the situation he may be in, he always knows what he must say and do. He may fall, but he cannot bring shame upon himself or his cause. If we seek the liberation of the people by means of a lie, we will surely grow confused, go astray, and lose sight of our objective, and if we have any influence at all on the people we will lead them astray as well — in other words, we will be acting in the spirit of reaction and to its benefit.

Reported in Josiah Hotchkiss Gilbert, Dictionary of Burning Words of Brilliant Writers (1895), p. 57.

Source: The Importance of Living (1937), Ch. I : The Awakening, p. 2

Letter to William Short (4 August 1820) http://www.stephenjaygould.org/ctrl/jefferson_jesus.html on his reason for composing a Syllabus of an Estimate of the Merit of the Doctrines of Jesus and referring to Jesus’ biographers, the Gospel writers. Published in Thomas Jefferson: Writings, Merrill D. Peterson, ed., New York: Library of America, 1994, pp. 1435–1440
1820s
Context: 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.