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“Most of the more complex emotions are common to the higher animals and ourselves. Every one has seen how jealous a dog is of his master's affection, if lavished on any other creature; and I have observed the same fact with monkeys. This shews that animals not only love, but have the desire to be loved.”

Charles Darwin book The Descent of Man, and Selection in Relation to Sex

volume I, chapter II: "Comparison of the Mental Powers of Man and the Lower Animals", pages 41-42 http://darwin-online.org.uk/content/frameset?pageseq=54&itemID=F937.1&viewtype=image The Descent of Man (1871)

“With highly civilised nations continued progress depends in a subordinate degree on natural selection; for such nations do not supplant and exterminate one another as do savage tribes. Nevertheless the more intelligent members within the same community will succeed better in the long run than the inferior, and leave a more numerous progeny, and this is a form of natural selection. The more efficient causes of progress seem to consist of a good education during youth whilst the brain is impressible, and of a high standard of excellence, inculcated by the ablest and best men, embodied in the laws, customs and traditions of the nation, and enforced by public opinion. It should, however, be borne in mind, that the enforcement of public opinion depends on our appreciation of the approbation and disapprobation of others; and this appreciation is founded on our sympathy, which it can hardly be doubted was originally developed through natural selection as one of the most important elements of the social instincts.”

Charles Darwin book The Descent of Man, and Selection in Relation to Sex

volume I, chapter V: "On the Development of the Intellectual and Moral Faculties during Primeval and Civilised Times" (second edition, 1874) page 143 http://darwin-online.org.uk/content/frameset?pageseq=166&itemID=F944&viewtype=image The Descent of Man (1871)

“Through the principle of associated habit, the same movements of the face and eyes are practised, and can, indeed, hardly be avoided, whenever we know or believe that others are blaming, or too strongly praising, our moral conduct.”

Charles Darwin book The Expression of the Emotions in Man and Animals

Source: The Expression of the Emotions in Man and Animals (1872), chapter XIII: "Self-attention — Shame — Shyness — Modesty: Blushing", page 347 http://darwin-online.org.uk/content/frameset?pageseq=375&itemID=F1142&viewtype=image

“Man differs from woman in size, bodily strength, hairyness, &c., as well as in mind, in the same manner as do the two sexes of many mammals.”

Charles Darwin book The Descent of Man, and Selection in Relation to Sex

volume I, chapter I: "The Evidence of the Descent of Man from some Lower Form", pages 13-14 http://darwin-online.org.uk/content/frameset?pageseq=26&itemID=F937.1&viewtype=image The Descent of Man (1871)

“The moral faculties are generally esteemed, and with justice, as of higher value than the intellectual powers. But we should always bear in mind that the activity of the mind in vividly recalling past impressions is one of the fundamental though secondary bases of conscience. This fact affords the strongest argument for educating and stimulating in all possible ways the intellectual faculties of every human being.”

Charles Darwin book The Descent of Man, and Selection in Relation to Sex

volume II, chapter XXI: "General Summary and Conclusion", page 393 http://darwin-online.org.uk/content/frameset?pageseq=410&itemID=F937.2&viewtype=image The Descent of Man (1871)

“I also attended on two occasions the operating theatre in the hospital at Edinburgh, and saw two very bad operations, one on a child, but I rushed away before they were completed. Nor did I ever attend again, for hardly any inducement would have been strong enough to make me do so; this being long before the blessed days of chloroform. The two cases fairly haunted me for many a long year.”

Charles Darwin

page 48 http://darwin-online.org.uk/content/frameset?pageseq=88&itemID=F1497&viewtype=image Autobiography (1958)

“It is a curious little world within itself”

Charles Darwin book The Voyage of the Beagle

About the island of Saint Helena
The Voyage of the Beagle (1839)
Source: http://www.darwinproject.ac.uk/letter/entry-305

“[T]he young and the old of widely different races, both with man and animals, express the same state of mind by the same movements.”

Charles Darwin book The Expression of the Emotions in Man and Animals

Source: The Expression of the Emotions in Man and Animals (1872), chapter XIV: "Concluding Remarks and Summary", page 352 http://darwin-online.org.uk/content/frameset?pageseq=380&itemID=F1142&viewtype=image

“It is impossible to answer your question briefly; and I am not sure that I could do so, even if I wrote at some length. But I may say that the impossibility of conceiving that this grand and wondrous universe, with our conscious selves, arose through chance, seems to me the chief argument for the existence of God; but whether this is an argument of real value, I have never been able to decide. I am aware that if we admit a first cause, the mind still craves to know whence it came, and how it arose. Nor can I overlook the difficulty from the immense amount of suffering through the world. I am, also, induced to defer to a certain extent to the judgment of the many able men who have fully believed in God; but here again I see how poor an argument this is. The safest conclusion seems to me that the whole subject is beyond the scope of man's intellect; but man can do his duty.”

Charles Darwin

volume I, chapter VIII: "Religion", pages 306-307 http://darwin-online.org.uk/content/frameset?pageseq=324&itemID=F1452.1&viewtype=image; letter http://www.darwinproject.ac.uk/entry-8837 to Dutch student N.D. Doedes (2 April 1873) The Life and Letters of Charles Darwin (1887)

“I would suggest to you the advantage, at present, of being very sparing in introducing theory in your papers (I formerly erred much in Geology in that way): let theory guide your observations, but till your reputation is well established be sparing in publishing theory. It makes persons doubt your observations. How rarely R. Brown ever indulged in theory: too seldom perhaps! Do not work too hard, and do not be discouraged because your work is not appreciated by the majority.”

Charles Darwin book More Letters of Charles Darwin

Letter to John Scott, quoted in More Letters of Charles Darwin: A Record of His Work in a Series of Hitherto Unpublished Letters http://books.google.com/books?id=8FXwAAAAMAAJ&, volume 2, page 323 (1903) Other letters, notebooks, journal articles, recollected statements

“I have watched how steadily the general feeling, as shown at elections, has been rising against Slavery. What a proud thing for England if she is the first European nation which utterly abolishes it! I was told before leaving England that after living in slave countries all my opinions would be altered; the only alteration I am aware of is forming a much higher estimate of the negro character. It is impossible to see a negro and not feel kindly towards him; such cheerful, open, honest expressions and such fine muscular bodies. I never saw any of the diminutive Portuguese, with their murderous countenances, without almost wishing for Brazil to follow the example of Hayti; and, considering the enormous healthy-looking black population, it will be wonderful if, at some future day, it does not take place.”

Charles Darwin

volume I, chapter VI: "The Voyage", page 246 http://darwin-online.org.uk/content/frameset?pageseq=264&itemID=F1452.1&viewtype=image; letter to sister Caroline Sarah Darwin (22 May 1833) The Life and Letters of Charles Darwin (1887)

“My wife has just finished reading aloud your 'Life with a Black Regiment,' and you must allow me to thank you heartily for the very great pleasure which it has in many ways given us. I always thought well of the negroes, from the little which I have seen of them; and I have been delighted to have my vague impressions confirmed, and their character and mental powers so ably discussed. When you were here I did not know of the noble position which you had filled. I had formerly read about the black regiments, but failed to connect your name with your admirable undertaking. Although we enjoyed greatly your visit to Down, my wife and myself have over and over again regretted that we did not know about the black regiment, as we should have greatly liked to have heard a little about the South from your own lips.”

Charles Darwin

volume III, chapter IV: "The Publication of the 'Descent of Man', page 176 http://darwin-online.org.uk/content/frameset?pageseq=188&itemID=F1452.3&viewtype=image; letter to Thomas Higginson (27 February 1873) The Life and Letters of Charles Darwin (1887)

“It seems to me absurd to doubt that a man may be an ardent Theist & an evolutionist. … I have never been an atheist in the sense of denying the existence of a God.”

Charles Darwin

Letter http://www.darwinproject.ac.uk/letter/entry-12041 to John Fordyce, 7 May 1879 Other letters, notebooks, journal articles, recollected statements

“There can be little doubt that the greater size and strength of man, in comparison with woman, together with his broader shoulders, more developed muscles, rugged outline of body, his greater courage and pugnacity, are all due in chief part to inheritance from his half-human male ancestors. These characters would, however, have been preserved or even augmented during the long ages of man's savagery, by the success of the strongest and boldest men, both in the general struggle for life and in their contests for wives; a success which would have ensured their leaving a more numerous progeny than their less favoured brethren.”

Charles Darwin book The Descent of Man, and Selection in Relation to Sex

second edition (1874), chapter XIX: "Secondary Sexual Characters of Man", page 563 http://darwin-online.org.uk/content/frameset?pageseq=586&itemID=F944&viewtype=image The Descent of Man (1871)

“I am quite conscious that my speculations run quite beyond the bounds of true science. … I inferred that genera & Families with very few species (i. e. from Extinction) would be apt (not necessarily always) to have narrow ranges & disjoined ranges. You will not perceive, perhaps, what I am driving at & it is not worth enlarging on, — but I look at Extinction as common cause of small genera & disjoined ranges & therefore they ought, if they behaved properly & as nature does not lie to go together!”

Charles Darwin

The first sentence is often quoted in isolation http://www.conservapedia.com/Charles_Darwin, with the suggestion that Darwin is saying that his speculations concerning evolution "run quite beyond the bounds of true science." In fact, as the context makes clear, Darwin is referring to his speculations concerning the geographical ranges of genera with few species. Other letters, notebooks, journal articles, recollected statements Source: Letter http://www.darwinproject.ac.uk/letter/entry-2109 to Asa Gray, 18 June 1857

“I am almost convinced (quite contrary to opinion I started with) that species are not (it is like confessing a murder) immutable.”

Charles Darwin

volume II, chapter II: "The Growth of the 'Origin of Species' — 1843-1856", page 23 http://darwin-online.org.uk/content/frameset?pageseq=39&itemID=F1452.2&viewtype=image; letter http://www.darwinproject.ac.uk/letter/entry-729 to J.D. Hooker (11 January 1844) The Life and Letters of Charles Darwin (1887)

“In this case, therefore, the worms judged with a considerable degree of correctness how best to draw the withered leaves of this foreign plant into their burrows; notwithstanding that they had to depart from their usual habit of avoiding the foot-stalk.”

Charles Darwin book The Formation of Vegetable Mould through the Action of Worms

Source: The Formation of Vegetable Mould through the Action of Worms (1881), Chapter 2: Habits of Worms, p. 70. http://darwin-online.org.uk/content/frameset?pageseq=85&itemID=F1357&viewtype=image

“Lastly, isolation, by checking immigration and consequently competition, will give time for any new variety to be slowly improved; and this may sometimes be of importance in the production of new species. If, however, an isolated area be very small, either from being surrounded by barriers, or from having very peculiar physical conditions, the total number of the individuals supported on it will necessarily be very small; and fewness of individuals will greatly retard the production of new species through natural selection, by decreasing the chance of the appearance of favourable variations.”

Charles Darwin book On the Origin of Species (1859)

This passage has been cited as an anticipation of the idea of punctuated equilibrium. Source: On the Origin of Species (1859), chapter IV: "Natural Selection", page 105 http://darwin-online.org.uk/content/frameset?pageseq=120&itemID=F373&viewtype=image

“Even insects express anger, terror, jealousy, and love by their stridulation.”

Charles Darwin book The Expression of the Emotions in Man and Animals

Source: The Expression of the Emotions in Man and Animals (1872), chapter XIV: "Concluding Remarks and Summary", page 350

“He remarks that "considering their weakness and their size, the work they are represented to have accomplished is stupendous." Here we have an instance of that inability to sum up the effects of a continually recurrent cause, which has often retarded the progress of science, as formerly in the case of geology, and more recently in that of the principle of evolution.”

Charles Darwin book The Formation of Vegetable Mould through the Action of Worms

Introduction, p. 6. http://darwin-online.org.uk/content/frameset?pageseq=21&itemID=F1357&viewtype=image The Formation of Vegetable Mould through the Action of Worms (1881)