First Quote Added
April 10, 2026
Latest Quote Added
"Which facts are relevant and which are not relevant to a science will be relative to the current state of development of that science."
"It should be no news to anyone that the perceptual judgements of individuals can be unreliable for a range of reasons. The challenge, in science, is to arrange the observable situation in such a way that the reliance on such judgements is minimised if not eliminated."
"Science is widely esteemed. Apparently it is a widely held belief that there is something special about science and its methods."
"Empiricism and positivism share the common view that scientific knowledge should in some way be derived from the facts arrived at by observation."
"Two normal observers viewing the same object from the same place under the same physical circumstances do not necessarily have identical visual experiences, even though the images on their respective retinas may be virtually identical."
"The experienced and skilled observer does not have perceptual experiences identical to those of the untrained novice when the two confront the same situation."
"A far as perception is concerned, the only things with which an observer has direct and immediate contact are his or her experiences."
"Scientists are typically good at making scientific progress, but not particularly good at articulating what the progress consists of."
"Science describes not just the observable world but also the world that lies beyond the appearances. This is a rough statement of realism with respect to science."
"Did you even know, until now, that human thought was capable of this degree of corruption? Yet Hegel grew out of Kant, Fichte, and Schelling, as naturally as Green, Bradley, and all the other later idealists, grew out of him. I mention these historical commonplaces, in case anyone should entertain the groundless hope of writing Hegel off as an isolated freak."
"Let us never forget, as all conventional history of philosophy conspires to make us forget, what the ‘great thinkers’ really are: proper objects, indeed, of pity, but even more, of horror."
"Plato – that scourge of the human mind, whom we have to thank for persuading philosophers for 2400 years, and more years to come, that it is a problem, how something can be a certain way and something else be the same way!"
"From an Enlightenment or Positivist point of view, which is Hume's point of view, and mine, there is simply no avoiding the conclusion that the human race is mad. There are scarcely any human beings who do not have some lunatic beliefs or other to which they attach great importance. People are mostly sane enough, of course, in the affairs of common life: the getting of food, shelter, and so on. But the moment they attempt any depth or generality of thought, they go mad almost infallibly. The vast majority, of course, adopt the local religious madness, as naturally as they adopt the local dress. But the more powerful minds will, equally infallibly, fall into the worship of some intelligent and dangerous lunatic, such as Plato, or Augustine, or Comte, or Hegel, or Marx."
"I have actually seen a cow escape from the well-grazed paddock in which she had long been kept, and promptly put her head back through the wire fence and begin grazing inside her former prison."
"The Faculty of Arts at the University of Sydney is a disaster-area, and not of the merely passive kind, like a bombed building, or an area that has been flooded. It is the active kind, like a badly-leaking nuclear reactor, or an outbreak of foot-and-mouth disease in cattle."
"The proprietor of a pornographic book shop may be dimly conscious of a debt to the author of Areopagitica, but Milton is the last person he wants to see in his shop."
"[Popper's skepticism about scientific truth in The Logic of Scientific Discovery is] that kind of reaction, of which the epitome is given in Aesop's fable of the fox and the grapes. The parallel would be complete if the fox, having become convinced that neither he nor anyone else could ever succeed in tasting grapes, should nevertheless write many long books on the progress of viticulture."
"If a lack of empirical foundations is a defect of the theory of logical probability, it is also a defect of deductive logic."
"A philosopher may try to prove the truth of something he believed before he was a philosopher, but even if he succeeds, his belief never regains the untroubled character, and the settled place in his mind, which it had at first."
"Muggeridge: ‘Positivism will deprive man, not only of all objects of religious reverence, but of all objects of the reverence which great philosophers have always, and rightly, received.’ True, Malcolm, except for the 'and rightly' part. In fact the reverence which has been and is accorded, by pre-Positivist man, to such two-legged plagues as Plato, Kant, and Hegel, is merely insane."
"In the interests of the ideal of maximum output, [our society] judges men by their fitness for jobs, not jobs by their fitness for men."
"The innovator, however, must in the first place be discontented, he must doubt the value of what he is doing or question the accepted ways of doing it. And secondly, he must be prepared to take fresh paths, to venture into fields where he is by no means expert. This is true, at least, of major forms of innovation; they make it possible for other men to be expert, but are not themselves forms of expertise. Freud was not an expert psycho-analyst; before Freud wrote there was no such thing; he created the standards by which psycho-analysts are judged expert. Neither was Marx an expert in interpreting history in economic terms nor Darwin an expert in evolutionary biology. If a man is trained, purely and simply, to be expert and contented in a particular task he will not innovate; Freud would have remained an anatomist, Marx a philosopher, Darwin a field-naturalist."
"That is why classical Utopias, and the modern dystopias which ironically incorporate their ideals, are static. … The technically expert citizen is expert only in his allotted task; for him to think about the value of that task is for him to pass completely beyond the limits of what is permissible."
"If “humility” means nothing more than the capacity to learn from criticism, then it has an undoubted value; but if “humility” means a willingness to submit to authority—to abandon or to modify what one is doing merely because it does not accord with the teachings of the Bible or the thoughts of Chairman Mao—then it is death to the spirit: the proper name for it, indeed, is “servility.”"
"Pride in one’s work carries with it a determination to accept the demands imposed by that work: in the case of philosophy to follow the argument where it leads, in the case of history to discover what actually happened, in the case of literature to explore to its depths a particular theme. In consequence, this sort of pride demands freedom: it has to be laid low in any authoritarian State. The historian, in such a system, has to conform to official interpretations of the past, the philosopher to dogmas, the writer to stereotypes of human action, the craftsman to “production-schedules.” More subtly, attempts are made to lay pride low in a consumer’s society: the film-director, the novelist, the craftsman are called upon to produce “what will sell” at whatever cost to their pride in workmanship."
"The Spanish Inquisition sought to avoid direct responsibility for the burning of heretics by handing them over to the secular arm; to burn them itself, it piously explained, would be wholly inconsistent with its Christian principles. Few of us would allow the Inquisition thus easily to wipe its hands clean of bloodshed; it knew quite well what would happen. Equally, where the technological application of scientific discoveries is clear and obvious — as when a scientist works on nerve gases — he cannot properly claim that such applications are "none of his business," merely on the ground that it is the military forces, not scientists, who use the gases to disable or kill. This is even more obvious when the scientist deliberately offers help to governments, in exchange for funds. If a scientist, or a philosopher, accepts funds from some such body as an office of naval research, then he is cheating if he knows his work will be useless to them and must take some responsibility for the outcome if he knows that it will be useful. He is subject, properly subject, to praise or blame in relation to any innovations which flow from his work."
"Ethics is inescapable."
"It is now generally accepted that the roots of our ethics lie in patterns of behavior that evolved among our pre-human ancestors, the social mammals and that we retain within our biological nature elements of these evolved responses. We have learned considerably more about these responses, and we are beginning to to understand how they interact with our capacity to reason."
"The animals themselves are incapable of demanding their own liberation, or of protesting against their condition with votes, demonstrations, or boycotts. Human beings have the power to continue to oppress other species forever, or until we make this planet unsuitable for living beings. Will our tyranny continue, proving that morality counts for nothing when it clashes with selfinterest, as the most cynical of poets and philosophers have always said? Or will we rise to the challenge and prove our capacity for genuine altruism by ending our ruthless exploitation of the species in our power, not because we are forced to do so by rebels or terrorists, but because we recognize that our position is morally indefensible? The way in which we answer this question depends on the way in which each one of us, individually, answers it."
"Those who claim to care about the wellbeing of human beings and the preservation of our environment should become vegetarians for that reason alone. They would thereby increase the amount of grain available to feed people elsewhere, reduce pollution, save water and energy, and cease contributing to the clearing of forests; moreover, since a vegetarian diet is cheaper than one based on meat dishes, they would have more money available to devote to famine relief, population control, or whatever social or political cause they thought most urgent. … when nonvegetarians say that “human problems come first” I cannot help wondering what exactly it is that they are doing for human beings that compels them to continue to support the wasteful, ruthless exploitation of farm animals."
"How far down the evolutionary scale shall we go? Shall we eat fish? What about shrimps? Oysters? To answer these questions we must bear in mind the central principle on which our concern for other beings is based. As I said … the only legitimate boundary to our concern for the interests of other beings is the point at which it is no longer accurate to say that the other being has interests. To have interests, in a strict, nonmetaphorical sense, a being must be capable of suffering or experiencing pleasure. If a being suffers, there can be no moral justification for disregarding that suffering, or for refusing to count it equally with the like suffering of any other being. But the converse of this is also true. If a being is not capable of suffering, or of enjoyment, there is nothing to take into account."
"To protest about bullfighting in Spain, the eating of dogs in South Korea, or the slaughter of baby seals in Canada while continuing to eat eggs from hens who have spent their lives crammed into cages, or veal from calves who have been deprived of their mothers, their proper diet, and the freedom to lie down with their legs extended, is like denouncing apartheid in South Africa while asking your neighbors not to sell their houses to blacks."
"Becoming a vegetarian is not merely a symbolic gesture. Nor is it an attempt to isolate oneself from the ugly realities of the world, to keep oneself pure and so without responsibility for the cruelty and carnage all around. Becoming a vegetarian is a highly practical and effective step one can take toward ending both the killing of nonhuman animals and the infliction of suffering upon them."
"[One thing] underpins, makes consistent, and gives meaning to all our other activities on behalf of animals. This one thing is that we take responsibility for our own lives, and make them as free of cruelty as we can. The first step is that we cease to eat animals. Many people who are opposed to cruelty to animals draw the line at becoming a vegetarian. It was of such people that Oliver Goldsmith, the eighteenth-century humanitarian essayist, wrote: "They pity, and they eat the objects of their compassion.""
"Let us consider first the view that it is always wrong to take an innocent human life. We may call this the “sanctity of life” view. People who take this view oppose abortion and euthanasia. They do not usually, however, oppose the killing of nonhuman animals—so perhaps it would be more accurate to describe this view as the “sanctity of human life” view. The belief that human life, and only human life, is sacrosanct is a form of speciesism."
"Speciesism—the word is not an attractive one, but I can think of no better term—is a prejudice or attitude of bias in favor of the interests of members of one's own species and against those of members of other species."
"Animal Liberation is Human Liberation too."
"People do not feel in any way ashamed or guilty about spending money on new clothes or a new car instead of giving it to famine relief. (Indeed, the alternative does not occur to them.) This way of looking at the matter cannot be justified. When we buy new clothes not to keep ourselves warm but to look "well-dressed" we are not providing for any important need. We would not be sacrificing anything significant if we were to continue to wear our old clothes, and give the money to famine relief. By doing so, we would be preventing another person from starving. It follows from what I have said earlier that we ought to give money away, rather than spend it on clothes which we do not need to keep us warm. To do so is not charitable, or generous. Nor is it the kind of act which philosophers and theologians have called "supererogatory" - an act which it would be good to do, but not wrong not to do. On the contrary, we ought to give the money away, and it is wrong not to do so."
"neither our distance from a preventable evil nor the number of other people who, in respect to that evil, are in the same situation as we are, lessens our obligation to mitigate or prevent that evil."
"if it is in our power to prevent something bad from happening, without thereby sacrificing anything of comparable moral importance, we ought, morally, to do it."
"I never believed in a God. [...] There may have been times when I wondered if there might be a God, but it always seemed to me wildly implausible that a God worth worshipping could allow the Holocaust to occur."
"I am a utilitarian. I am also a vegetarian. I am a vegetarian because I am a utilitarian."
"Philosophy is not politics, and we do our best, within our all-too-human limitations, to seek the truth, not to score points against opponents. There is little satisfaction in gaining an easy triumph over a weak opponent while ignoring better arguments against your views."
"The evidence of our own eyes makes it more plausible to believe that the world was not created by any god at all. If, however, we insist on believing in divine creation, we are forced to admit that the god who made the world cannot be all-powerful and all good. He must be either evil or a bungler."
"Speciesism is an attitude of prejudice towards beings because they're not members of our species, so just as racism means that you're prejudiced against beings who are not members of your race and sexism means you're prejudiced against people of the other sex. So we humans tend to be speciesist in we think that any being that is a member of the species homo sapien just automatically has a higher moral status and is more important than any being that is a member of any other species, irrespective of the actual characteristics of those beings."
"To be honest, I was somewhat disappointed... It's had effects around the margins, of course, but they have mostly been minor. When I wrote it, I really thought the book would change the world. I know it sounds a little grand now, but at the time the sixties still existed for us. It looked as if real changes were possible, and I let myself believe that this would be one of them. All you have to do is walk around the corner to McDonald's to see how successful I have been."
"Inaugurated in 1975 by Peter Singer“s famous pamphlet, ”'Animal Liberation“”, philosophical research into our duties towards animals, the moral rights to be ascribed to them, how it is right to treat them, and which practices — economic, scientific, technological—are consistent with the principles of a normative ethic that includes among its “clients” the grandchildren of Bentham and Kant as much as those of Fido or Pluto, is now vast. (p. 7)"
"At one level, this movement on behalf of oppressed farm animals is emotional...Yet the movement is also the product of a deep intellectual ferment pioneered by the Princeton scholar Peter Singer...This idea popularized by Professor Singer — that we have ethical obligations that transcend our species — is one whose time appears to have come...What we’re seeing now is an interesting moral moment: a grass-roots effort by members of one species to promote the welfare of others...animal rights are now firmly on the mainstream ethical agenda."
"Some of Singer's critics call him a Nazi and compare his proposals to Hitler's schemes for eliminating the unwanted, the unfit and the disabled. But...Singer is no Hitler. He doesn't want state-sponsored killings. Rather, he wants the decision to kill to be made by you and me. Instead of government-conducted genocide, Singer favors free-market homicide."
"I regard Peter as one of the great moralists, because I suspect that more than anyone he has helped to change the attitudes of very many people to the sufferings of animals. Peter is a utilitarian in normative ethics, and a humane attitude to animals is a natural corollary of utilitarianism. Utilitarian concern for animals goes back to Bentham, who, presumably alluding to the Kantians, said that the question was not whether animals can reason, but whether they can suffer."