Aime Cesaire is one of the great voices of the anti-colonial struggle and was the teacher of Fanon (Black Skin, White Masks & The Wretched of the Earth). Cesaire's "Discourse on Colonialism" was originally published in French in 1950, the English version I am using was translated in 1972 and republished in 2000. For the quotes below, note that this version of "Discourse on Colonialism" has an opening work by Kelley and a closing interview with Rene Depestre, and as a result the page numbering may differ from other versions / publications of the book.
Cesaire opens: "A civilization that proves incapable of solving the problems it creates is a decadent civilization. A civilization that chooses to close its eyes to its most crucial problems is a stricken civilization. A civilization that uses its principles for trickery and deceit is a dying civilization." (p. 31)
"First we must study how colonization works to decivilize the colonizer, to brutalize him in the true sense of the word, to degrade him, to awaken him to buried instincts, to covetousness, violence, race hatred, and moral relativism; and we must show that each time a head is cut off or an eye put out in Vietnam and in France they accept the fact, each time a little girl is raped and in France they accept the fact, each time a Madagascan is tortured and in France they accept the fact, civilization acquires another dead weight, a universal regression takes place, a gangrene sets in, a center of infection begins to spread; and that at the end of all these treaties that have been violated, all these lies that have been propagated, all these punitive expeditions that have been tolerated, all these prisoners who have been tied up and interrogated, all these patriots who have been tortured, at the end of all the racial pride that has been encouraged, all the boastfulness that has been displayed, a poison has been instilled into the veins of Europe and, slowly but surely, the continent proceeds toward savagery... and they hide the truth from themselves, that it is barbarism, but the supreme barbarism, the crowning barbarism that sums up all the daily barbarisms; that it is Nazism, yes, but that before they were its victims, they were its accomplices; that they tolerated that Nazism before it was inflicted on them, that they absolved it, shut their eyes to it, legitimized it, because, until then, it had been applied only to non-European peoples; that they have cultivated that Nazism, that they are responsible for it, and that before engulfing the whole of Western, Christian civilization in its reddened waters, it oozes, seeps, and trickles from every crack." (p. 35-36)
"What am I driving at? At this idea: that no one colonizes innocently, that no one colonizes with impunity either; that a nation which colonizes, that a civilization which justifies colonization - and therefore force - is already a sick civilization, a civilization that is morally diseased, that irresistibly, progressing from one consequence to another, one repudiation to another, calls for its Hitler, I mean its punishment." (p. 39)
"...colonial activity, colonial enterprise, colonial conquest, which is based on contempt for the native and justified by that contempt, inevitably tends to change him who undertakes it; that the colonizer, who in order to ease his conscience gets into the habit of seeing the other man as an animal, accustoms himself to treating him like an animal, and tends objectively to transform himself into an animal." (p. 41)
"Therefore, comrade, you will hold as enemies - loftily, lucidly, consistently - not only sadistic governors and greedy bankers, not only prefects who torture and colonists who flog, not only corrupt, check-licking politicians and subservient judges, but likewise and for the same reason, venomous journalists, goitrous academicians, wreathed in dollars and stupidity, ethnographers who go in for metaphysics, presumptuous Belgian theologians, chattering intellectuals born stinking out of the thigh of Nietzsche, the paternalists, the embracers, the corrupters, the back-slappers, the lovers of exoticism, the dividers, the agrarian sociologists, the hoodwinkers, the hoaxers, the hot-air artists, the humbugs, and in general, all those who, performing their functions in the sordid division of labor for the defense of Western bourgeois society, try in divers ways and by infamous diversions to split up the forces of Progress-even if it means denying the very possibility of Progress - all of them tools of capitalism, all of them, openly or secretly, supporters of plundering colonialism, all of them responsible, all hateful, all slave-traders, all henceforth answerable for the violence of revolutionary action." (p. 54-55)
"That the West invented science. That the West alone knows how to think; that at the borders of the Western world there begins the shadowy realm of primitive thinking, which, dominated by the notion of participation, incapable of logic, is the very model of faulty thinking." (p. 69)