In fact, the whole idea of illusion seems to make sense only if we accept the reality of the illusory experience as an experience and question only what it seems to be telling us about the outside world. Optical illusions do really hapen. What they can’t do is provide accurate measurements of the outside world. The idea of having, so to speak, two successive layers of illusion here is unworkable.

The point cannot be just survival, nor even survival in numbers. Survival is just as well achieved by much less ambitions creatures which go in for sheer number. (In fact a cost-benefit-conscious gene that really understood its business would, no doubt, have remained on board something like the amoeba; it will probably be amoung the last to go.) Nor is it survival-as-society, since many animals achieve this despite a lot of bickering.

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The symbolism of meat-eating is never neutral. To himself, the meat-eater seems to be eating life. To the vegetarian, he seems to be eating death. There is a kind of gestalt-shift between the two positions which makes it hard to change, and hard to raise questions on the matter at all without becoming embattled.

Many people fail to grasp this point, apparently because they think of "scientific" evidence as only that produced in laboratories by controlled experiments. This leads them to treat field studies, however careful, thorough and well-documented, as "anecdotal"--mere preparation for the real thing, therefore properly ignored till it bears fruit entitled to be considered by learned persons. This attitude was much like that of cavalry generals in the First World War, waiting patiently for the infantry to clear the ground so that they could make the dashing charges that alone they thought entitled the name of warfare. Because these creatures are complex, only a tiny fraction of important truths about them can ever be seen in laboratories of expressed in control experiments. The same, of course, is true of the human race.

The motivation of living creatures does got boil down to any single basic force, not even an 'instinct of self-preservation.' It is a complex pattern of separate elements, balanced roughly in the constitution of the species, but always liable to need adjusting. Creatures really have divergent and conflicting desires. Their distinct motives are not (usually) wishes for survival or for means to survival, but for various particular things to be done and obtained while surviving. And these can always conflict. Motivation is fundamentally plural. . . An obsessive creature dominated constantly by one kind of motive, would not survive.

Creatures really have divergent and conflicting desires. Their distinct motives are not (usually) wishes for survival or for means-to-survival, but for various particular things to be done and obtained while surviving. And these can always conflict. Motivation is fundamentally plural. It must be so because, in evolution, all sorts of contingincies and needs arise, calling for all sorts of different responses. An obsessive creature, constantly dominated by one kind of motive, would not survive.

If we ask how creatures [bees] that act so elaborately against their private advantage can have evolved, the answer lies in their mode of reproduction. Most workers are sterile. The unit of selection is normally the whole community. Its prosperity depends on the efficiency of the workers. An uncooperative strain would simply revert toward the solitary life these insects started from and in which many would still remain..So it is natural to understand their evolution, as we would that of a plant, without reference to the plans or wishes of the individual bees.

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It would be quite false to say that competition is the only relation that obtains between species. Mutual dependence is in general quite as important. Each kind exists within an ecosystem, and needs the others to keep the system going. Thus, grazing animals on the African plains co-exist because each specializes in eating some particular kind of plant, and needs the others to keep the whole pasture at a balanced level. They depend, too, on each other's specialized capacities to give warning of danger. … each also depends for survival on innumerable others, such as the insects which pollinate the plants, the fauna of their intestines and of course their predators. It is unthinkable that any species should be an island.

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The notion that we "have a nature" far from threatening the concept of freedom, is absolutely essential to it. If we were genuinely plastic and indeterminate at birth, there could be no reason why society should not stamp us into any shape that might suit it. The reason people view suggestions about inborn tendencies with such indiscriminate horror seems to be that they think exclusively in one particular way in which the idea of such tendencies has been misused, namely, that where conservative theorists invoke them uncritically to resist reform. But liberal theorists who combat such resistance need them just as much, and indeed, usually more. The early architects of our current notion of freedom made human nature their cornerstone. Rousseau's trumpet call "Man is born free, but everywhere he is in chains," makes sense only as description of our innate constitution as something positive, already determined, and conflicting with what society does to us. Kant and Mill took similar positions. And Marx, though he officially dropped the notion of human nature and attacked the term, relied on the idea as much as anybody else for his crucial notion of Dehumanization.

The trouble with words like "fit" in these discussions is that, if taken in a wide sense they are liable to become vacuous, and if taken more narrowly they easily become tendentious. Thus the phrase "survival of the fittest" does not mean much if it means only "survival of those most likely to survive." If on the hand it means "survival of those whom we should admire most" or the like, it describes a different state of affairs; we shall need different arguments to persuade us that this is happening. In just the same way, Wilson equivocates with the notion that to be "fit" is an advantage to anybody. If it means "healthy" or "able to do what he wants to do" then it usually is so. But if it only means "likely to have many descendants," then there is no reason for treating it as an advantage at all.

Still, people have a lot of obvious and important things that other species do not–speech, rationality, culture and the rest. Comparison must deal with these. I have tried to discuss some of the most important of them, not attempting at all to deny their uniqueness, but merely to grasp how they occur in what is, after a primate species, not a brand of machine or a type of disembodied spirit. I have tried to show these capabilites as continuous with our animal nature, connected with our basic structure of motives.

Speaking of an institution such as marriage as natural is, of course, paying it a compliment, the compliment of saying that it meets a fairly central human need. The fact that it is found in some form in every human society is in a way enough to show. But it might be thought that marriage became thus widespread only because it was, like adequate sanitation, a means to an end. This is pretty certainly what Hume thought, as evidenced by his very confused contrast of natural with artificial virtues. He regarded human sagacity simply as the power to calculate consequences, and counted chastity and fidelity, with justice, as artificial virtues, devices designed merely to produce safety and promote utility. In a species as emotionally interdependent as man this view of marriage is nonsense. Pair-formation could never have entered anybody's head as a device deliberately designated to promote utility.

What do we mean when we speak...of higher and lower animals? ...What too about communication (a respect in which, Wilson says, we much exceed the insects)? What is so good about communicating? How are we sure that it constitutes and excellence? Is it even clear that in respect we do exceed the corals and the colonial jellyfish? With them, there are no internal barriers; information flow freely from unit to unit wherever it is needed. The unrestrictedness of the communication much exceeds that among people. Why does this fail to impress us?