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.

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.

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.

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Let us start by considering why the attempt to glorify science on its own cannot work. This is because human thought operates as a whole. It is an ecosphere, a vast and complex landscape, including, but not confined to, common sense. Science itself is, of course, not a single compartment but a large, thickly wooded area comprising many sciences, an area that merges into those around it. Those sciences vary from physics to anthropology and all of them are shot through with problems coming from areas outside them, such as philosophy and history. Biology, for instance, has to deal with philosophical problems about the concept of life and also with vast historical problems about evolution for which it uses historical methods, not those of physics.

Scientism exalts the idea of science on its own, causing people to become fixated on the assumptions that seemed scientific to them during their formative years. This prevents them from seeing contrary facts, however glaring they may be, that have been noticed more lately.

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.

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.

We must face unconsidered possibilities and ask ourselves alarming questions–for instance, must we perhaps let the self-destroyer go if he really wants to? Trying to answer this by collecting information about our own neurones would be no more use than doing it, like the Roman augur, by inspecting the entrails of a goat.