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7 " We must consider also whether soul is divisible or is without parts, and whether it is everywhere homogeneous or not; and if not homogeneous, whether its various forms are different specifically or generically; up to the present time those who have discussed and investigated soul seem to have confined themselves to the human soul. We must be careful not to ignore the question whether soul can be defined in a single account, as is the case with animal, or whether we must not give a separate account of each sort of it, as we do for horse, dog, man, god (in the latter case the universal, animal—and so too every other common predicate—is either nothing or posterior). Further, if what exists is not a plurality of souls, but a plurality of parts of one soul, which ought we to investigate first, the whole soul or its parts? It is also a difficult problem to decide which of these parts are in nature distinct from one another. Again, which ought we to investigate first, these parts or their functions, mind or thinking, the faculty or the act of sensation, and so on? If the investigation of the functions precedes that of the parts, the further question suggests itself: ought we not before either to consider the correlative objects, e.g. of sense or thought? It seems not only useful for the discovery of the causes of the incidental proprieties of substances to be acquainted with the essential nature of those substances (as in mathematics it is useful for the understanding of the property of the equality of the interior angles of a triangle to two right angles to know the essential nature of the straight and the curved or of the line and (the plane) but also conversely, for the knowledge of the essential nature of a substance is largely promoted by an acquaintance with its properties: for, when we are able to give an account conformable to experience of all or most of the properties of a substance, we shall be in the most favourable position to say something worth saying about the essential nature of that subject: in all demonstration a definition of the essence is required as a starting point, so that definitions which do not enable us to discover the incidental properties, or which fail to facilitate even a conjecture about them, must obviously, one and all, be dialectical and futile." —from_On the Soul: Book I_ "

16 " The first objection is that it is rubbish to talk about natural meanings and purposes, because we merely imagine such things. According to the objector's way of thinking, meanings and purposes aren't natural—they aren't really in the things themselves—they are merely in the eye of the beholder. But is this true? Take the lungs, for example. When we say that their purpose is to oxygenate the blood, are we just making that up? Of course not. The purpose of oxygenation isn't in the eye of the beholder; it's in the design of the lungs themselves. There is no reason for us to have lungs apart from it. Suppose a young man is more interested in using his lungs to get high by sniffing glue. What would you think of me if I said, “That's interesting—I guess the purpose of my lungs is to oxygenate my blood, but the purpose of his lungs is to get high?” You'd think me a fool, and rightly so. By sniffing glue, he doesn't change the purpose built into his lungs, he only violates it. We can ascertain the purposes of the other features of our design in the same way. The purpose of the eyes is to see, the purpose of the heart is to pump blood, the purpose of the thumb is to oppose the fingers so as to grasp, the purpose of the capacity for anger is to protect endangered goods, and so on. If we can ascertain the meanings and purposes of all those other powers, there is no reason to think that we cannot ascertain the meanings and purposes of the sexual powers. Natural function and personal meaning are not alien to each other. They are connected. In a rightly ordered way of thinking, they turn out to be different angles of vision on the same thing.

The second objection is that it doesn't make any difference even if we can ascertain the meanings or purposes of the sexual powers, because an is does not imply an ought. This dogma too is false. If the purpose of eyes is to see, then eyes that see well are good eyes, and eyes that see poorly are poor ones. Given their purpose, this is what it means for eyes to be good. Moreover, good is to be pursued; the appropriateness of pursuing it is what it means for anything to be good. Therefore, the appropriate thing to do with poor eyes is try to turn them into good ones. If it really were impossible to derive an ought from the is of the human design, then the practice of medicine would make no sense. Neither would the practice of health education. Consider the young glue-sniffer again. How should we advise him? Is the purpose of his lungs irrelevant? Should we say to him, “Sniff all you want, because an is does not imply an ought”? Of course not; we should advise him to kick the habit. We ought to respect the is of our design. Nothing in us should be put into action in a way that flouts its inbuilt meanings and purposes. "

J. Budziszewski , On the Meaning of Sex

20 " David Lester, a psychology professor at Richard Stockton College in New Jersey, has likely thought about suicide longer, harder, and from more angles than any other human. In more than twenty-five-hundred academic publications, he has explored the relationship between suicide and, among other things, alcohol, anger, antidepressants, astrological signs, biochemistry, blood type, body type, depression, drug abuse, gun control, happiness, holidays, Internet use, IQ, mental illness, migraines, the moon, music, national-anthem lyrics, personality type, sexuality, smoking, spirituality, TV watching, and wide-open spaces.
Has all this study led Lester to some grand unified theory of suicide? Hardly. So far he has one compelling notion. It’s what might be called the “no one left to blame” theory of suicide. While one might expect that suicide is highest among people whose lives are the hardest, research by Lester and others suggests the opposite: suicide is more common among people with a higher quality of life.
“If you’re unhappy and you have something to blame your unhappiness on—if it’s the government, or the economy, or something—then that kind of immunizes you against committing suicide,” he says. “It’s when you have no external cause to blame for your unhappiness that suicide becomes more likely. I’ve used this idea to explain why African-Americans have lower suicide rates, why blind people whose sight is restored often become suicidal, and why adolescent suicide rates often rise as their quality of life gets better. "

Steven D. Levitt , Think Like a Freak