That is not the nature of scientific reasoning today. We say that food and water are necessary conditions of life for man and beast. Had we not had these conditions we would not have existed. But it is not the purpose of water or oranges to be food for us.
In the question of causality then, we are tempted to say that Aristotle was wrong. But let us not be too hasty. Many people believe that God created the world as it is so that all His creatures could live in it. Viewed in this way, it can naturally be claimed that there is water in the rivers because animals and humans need water to live. But now we are talking about God’s purpose. The raindrops and the waters of the river have no interest in our welfare.
Logic
The distinction between “form” and “substance” plays an important part in Aristotle’s explanation of the way we discern things in the world.
When we discern things, we classify them in various groups or categories. I see a horse, then I see another horse, and another. The horses are not exactly alike, but they have something in common, and this common something is the horse’s “form.” Whatever might be distinctive, or individual, belongs to the horse’s “substance.”
So we go around pigeonholing everything. We put cows in cowsheds, horses in stables, pigs in pigsties, and chickens in chicken coops. The same happens when Sophie Amundsen tidies up her room. She puts her books on the bookshelf, her schoolbooks in her schoolbag, and her magazines in the drawer. Then she folds her clothes neatly and puts them in the closet—underwear on one shelf, sweaters on another, and socks in a drawer on their own. Notice that we do the same thing in our minds. We distinguish between things made of stone, things made of wool, and things made of rubber. We distinguish between things that are alive or dead, and we distinguish between vegetable, animal, and human.
Do you see, Sophie? Aristotle wanted to do a thorough clearing up in nature’s “room.” He tried to show that everything in nature belongs to different categories and subcategories. (Hermes is a live creature, more specifically an animal, more specifically a vertebrate, more specifically a mammal, more specifically a dog, more specifically a Labrador, more specifically a male Labrador.)
Go into your room, Sophie. Pick up something, anything, from the floor. Whatever you take, you will find that what you are holding belongs to a higher category The day you see something you are unable to classify you will get a shock. If, for example, you discover a small whatsit, and you can’t really say whether it is animal, vegetable, or mineral—I don’t think you would dare touch it.
Saying animal, vegetable, and mineral reminds me of that party game where the victim is sent outside the room, and when he comes in again he has to guess what everyone else is thinking of. Everyone has agreed to think of Fluffy, the cat, which at the moment is in the neighbor’s garden. The victim comes in and begins to guess. The others must only answer “yes” or “no.” If the victim is a good Aristotelian—and therefore no victim—the game could go pretty much as follows:
Is it concrete? (Yes!) Mineral? (No!) Is it alive? (Yes!) Vegetable? (No!) Animal? (Yes!) Is it a bird? (No!) Is it a mammal? (Yes!) Is it the whole animal? (Yes!) Is it a cat? (Yes!) Is it Fluffy? (Yeah! Laughter. . .)
So Aristotle invented that game. We ought to give Plato the credit for having invented hide-and-seek. Democritus has already been credited with having invented Lego.
Aristotle was a meticulous organizer who set out to clarify our concepts. In fact, he founded the science of Logic. He demonstrated a number of laws governing conclusions or proofs that were valid. One example will suffice. If I first establish that “all living creatures are mortal” (first premise), and then establish that “Hermes is a living creature” (second premise), I can then elegantly conclude that “Hermes is mortal.”
The example demonstrates that Aristotle’s logic was based on the correlation of terms, in this case “living creature” and “mortal.” Even though one has to admit that the above conclusion is 100% valid, we may also add that it hardly tells us anything new. We already knew that Hermes was “mortal.” (He is a “dog” and all dogs are “living creatures”—which are “mortal,” unlike the rock of Mount Everest.) Certainly we knew that, Sophie. But the relationship between classes of things is not always so obvious. From time to time it can be necessary to clarify our concepts.
For example: Is it really possible that tiny little baby mice suckle just like lambs and piglets? Mice certainly do not lay eggs. (When did I last see a mouse’s egg?) So they give birth to live young—just like pigs and sheep. But we call animals that bear live young mammals—and mammals are animals that feed on their mother’s milk. So—we got there. We had the answer inside us but we had to think it through. We forgot for the moment that mice really do suckle from their mother. Perhaps it was because we have never seen a baby mouse being suckled, for the simple reason that mice are rather shy of humans when they suckle their young.
Nature’s Scale
When Aristotle “clears up” in life, he first of all points out that everything in the natural world can be divided into two main categories. On the one hand there are nonliving things, such as stones, drops of water, or clumps of soil. These things have no potentiality for change. According to Aristotle, nonliving things can only change through external influence. Only living things have the potentiality for change.
Aristotle divides “living things” into two different categories. One comprises plants, and the other creatures. Finally, these “creatures” can also be divided into two subcategories, namely animals and humans.
You have to admit that Aristotle’s categories are clear and simple. There is a decisive difference between a living and a nonliving thing, for example a rose and a stone, just as there is a decisive difference between a plant and an animal, for example a rose and a horse. I would also claim that there definitely is a difference between a horse and a man. But what exactly does this difference consist of? Can you tell me that?
Unfortunately I do not have time to wait while you write the answer down and put it in a pink envelope with a lump of sugar, so I’ll answer myself. When Aristotle divides natural phenomena into various categories, his criterion is the object’s characteristics, or more specifically what it can do or what it does.
All living things (plants, animals, humans) have the ability to absorb nourishment, to grow, and to propagate. All “living creatures” (animals and humans) have in addition the ability to perceive the world around them and to move about. Moreover, all humans have the ability to think—or otherwise to order their perceptions into various categories and classes.
So there are in reality no sharp boundaries in the natural world. We observe a gradual transition from simple growths to more complicated plants, from simple animals to more complicated animals. At the top of this “scale” is man—who according to Aristotle lives the whole life of nature. Man grows and absorbs nourishment like plants, he has feelings and the ability to move like animals, but he also has a specific characteristic peculiar to humans, and that is the ability to think rationally.
Therefore, man has a spark of divine reason, Sophie. Yes, I did say divine. From time to time Aristotle reminds us that there must be a God who started all movement in the natural world. Therefore God must be at the very top of nature’s scale.
Aristotle imagined the movement of the stars and the planets guiding all movement on Earth. But there had to e something causing the heavenly bodies to move. Aristotle called this the “first mover,” or “God.” The “first mover” is itself at rest, but it is the “formal cause” of the movement of the heavenly bodies, and thus of all movement in nature.
Ethics
Let us go back to man, Sophie. According to Aristotle, man’s “form” comprises a soul, which has a plant-like part, an animal part, and a rational part. And now he asks: How should we live? What does it require to live a good life? His answer: Man can only achieve happiness by using all his abilities and capabilities.
Aristotle held that there are three forms of happiness. The first form of happiness is a life of pleasure and enjoyment. The second form of happiness is a life as a free and responsible citizen. The third form of happiness is a life as thinker and philosopher.
Aristotle then emphasized that all three criteria must be present at the same time for man to find happiness and fulfillment. He rejected all forms of imbalance. Had he lived today he might have said that a person who only develops his body lives a life that is just as unbalanced as someone who only uses his head. Both extremes are an expression of a warped way of life.
The same applies in human relationships, where Aristotle advocated the “Golden Mean.” We must be neither cowardly nor rash, but courageous (too little courage is cowardice, too much is rashness), neither miserly nor extravagant but liberal (not liberal enough is miserly, too liberal is extravagant). The same goes for eating. It is
