“Here was the worldly environment with which Fauchery is so often reproached. But the books and papers that littered the table bore witness that the present occupant of this charming retreat remained a substantial man of letters. His habit of constant work was still further attested by his face, which I admit, gave me all at once a feeling of remorse for the trick I was about to play him. If I had found him the snobbish pretender whom the weekly newspapers were in the habit of ridiculing, it would have been a delight to outwit his diplomacy. But no! I saw, as he put down his pen to receive me, a man about fifty-seven years old, with a face that bore the marks of reflection, eyes tired from sleeplessness, a brow heavy with thought, who said as he pointed to an easy chair, "You will excuse me, my dear confrère, for keeping you waiting."”

volume I, chapter II: "Autobiography", page 40 http://darwin-online.org.uk/content/frameset?pageseq=58&itemID=F1452.1&viewtype=image
The Life and Letters of Charles Darwin (1887)

Letter to Evert Augustus Duyckinck (3 March 1849); published in The Letters of Herman Melville (1960) edited by Merrell R. Davis and William H. Gilman, p. 78; a portion of this is sometimes modernized in two ways:
Context: I do not oscillate in Emerson's rainbow, but prefer rather to hang myself in mine own halter than swing in any other man's swing. Yet I think Emerson is more than a brilliant fellow. Be his stuff begged, borrowed, or stolen, or of his own domestic manufacture he is an uncommon man. Swear he is a humbug — then is he no common humbug. Lay it down that had not Sir Thomas Browne lived, Emerson would not have mystified — I will answer, that had not Old Zack's father begot him, old Zack would never have been the hero of Palo Alto. The truth is that we are all sons, grandsons, or nephews or great-nephews of those who go before us. No one is his own sire. — I was very agreeably disappointed in Mr Emerson. I had heard of him as full of transcendentalisms, myths & oracular gibberish; I had only glanced at a book of his once in Putnam's store — that was all I knew of him, till I heard him lecture. — To my surprise, I found him quite intelligible, tho' to say truth, they told me that that night he was unusually plain. — Now, there is a something about every man elevated above mediocrity, which is, for the most part, instinctuly perceptible. This I see in Mr Emerson. And, frankly, for the sake of the argument, let us call him a fool; — then had I rather be a fool than a wise man. —I love all men who dive. Any fish can swim near the surface, but it takes a great whale to go down stairs five miles or more; & if he don't attain the bottom, why, all the lead in Galena can't fashion the plumet that will. I'm not talking of Mr Emerson now — but of the whole corps of thought-divers, that have been diving & coming up again with bloodshot eyes since the world began.
I could readily see in Emerson, notwithstanding his merit, a gaping flaw. It was, the insinuation, that had he lived in those days when the world was made, he might have offered some valuable suggestions. These men are all cracked right across the brow. And never will the pullers-down be able to cope with the builders-up. And this pulling down is easy enough — a keg of powder blew up Block's Monument — but the man who applied the match, could not, alone, build such a pile to save his soul from the shark-maw of the Devil. But enough of this Plato who talks thro' his nose.

Source: On the Jellicoe Road

Man and Socialism in Cuba (1965)
Context: Man still needs to undergo a complete spiritual rebirth in his attitude towards his work, freed from the direct pressure of his social environment, though linked to it by his new habits. That will be communism.
The change in consciousness will not take place automatically, just as it doesn't take place automatically in the economy. The alterations are slow and are not harmonious; there are periods of acceleration, pauses and even retrogressions.

Source: from: 'A letter to Maurice Denis, p. 237

Preface to Selected Poems, André Deutsch Ltd, London, 1983, ISBN 0233975039
Other Quotes

Source: Andre Cornelis (1886), Ch. 14
Context: Is there any God, any justice, is there either good or evil? None, none, none, none! There is nothing but a pitiless destiny which broods over the human race, iniquitous and blind, distributing joy and grief at haphazard. A God who says, "Thou shalt not kill," to him whose father has been killed? No, I don't believe it. No, if hell were there before me, gaping open, I would make answer: "I have done well," and I would not repent. I do not repent. My remorse is not for having seized the weapon and struck the blow, it is that I owe to him — to him — that infamous good service which he did me — that I cannot to the present hour shake from me the horrible gift I have received from that man. If I had destroyed the paper, if I had gone and given myself up, if I had appeared before a jury, revealing, proclaiming my deed, I should not be ashamed; I could still hold up my head. What relief, what joy it would be if I might cry aloud to all men that I killed him, that he lied, and I lied, that it was I, I, who took the weapon and plunged it into him! And yet, I ought not to suffer from having accepted — no — endured the odious immunity. Was it from any motive of cowardice that I acted thus? What was I afraid of? Of torturing my mother, nothing more. Why, then, do I suffer this unendurable anguish? Ah, it is she, it is my mother who, without intending it, makes the dead so living to me, by her own despair. She lives, shut up in the rooms where they lived together for sixteen years; she has not allowed a single article of furniture to be touched; she surrounds the man's accursed memory with the same pious reverence that my aunt formerly lavished on my unhappy father. I recognize the invincible influence of the dead in the pallor of her cheeks, the wrinkles in her eyelids, the white streaks in her hair. He disputes her with me from the darkness of his coffin; he takes her from me, hour by hour, and I am powerless against that love.

Campbell's recollection in 1819 after a visit to Swellendam, quoted in Die Wêreld van Susanna Smit, 1799–1863, Schoeman (1995)

Surprised by Joy (1955)