Introduction
The concept of substance is significant to Aristotle’s metaphysics. To understand why this is the case, one must first consider the three sciences that make up the science of metaphysics. These include the science of entity for what it is, the science of God, and the science of substance (Marias, 2012). The three are closely tied resulting in Aristotle’s conclusion that metaphysics is a single science. The science of entity studies different entities and regards the highest entity as God. This is an entity that is completely self-sufficient, hence, earning the title; ‘the highest entity’. The science that concerns itself with this entity is the highest science. This is the theological science or the science of God. Finally, all the entities find unity in substance. Substance permits the expression of entities and, consequently, that of being. Hence, Aristotle asserts that substance is the basic meaning of being. This relationship shows how substance features in Aristotle’s philosophy. All entities share the nature of being and the fundamental analogous unity of being is substance. Hence, all entities are substances.
Substances
In Aristotle’s metaphysics, a substance is a thing in itself. It is independent of others, hence exists in itself (Marias, 2012). This differs from the common understanding of the word such as when we refer to goods or property. Neither does it refer to the value of something such as when we talk of a man of substance. Instead, substances are viewed as things that consist of possibilities of each thing. For instance, we may consider ‘smooth.’ This is a word that describes the texture of a thing. Hence smooth cannot exist in itself. Therefore, it is disqualified as a substance. In this case, the substance is the thing it describes such as a stone. The stone makes smoothness possible. Qualities such as smooth are referred to as ‘accidents’ and are supported by substances. Another example is color. If we talk of a green leaf, the color green is made possible by the leaf hence it is dependent on the leaf. The color green is an accident while the leaf is a substance. Earlier on in the introduction, it was mentioned that substance is the analogous unity of being. It is important, therefore, to understand this relationship between being and substance.
Relationship between Being and Substance
Being is the analogical nature of the entity. There are many different types of entities. In addition to the highest entity as mentioned earlier, there exist others including natural things and mathematical objects. Natural things are physical objects which contain the principle of motion within themselves, such as a tree, man, or a certain animal. Mathematical objects, on the other hand, do not exist as things but instead only exist in the mind (Aristotle, 2013). Regardless of the differences, all these entities share one thing in common. This is being. There are four modes of being including being by essence or by accident, by categories, true being or false beings, and potential and actual beings. These different modes share one thing in common; substance. Therefore, an understanding of being facilitates comprehension of substance.
Being by Essence or by Accident
An entity can either be a being per se or by accident. For instance, we may describe a man as living and having athletic capabilities. This example enables us to distinguish between essence and accident. Life is a man’s essence. Without life, then there can be no man. On the other hand, athletic capabilities are gained by accident. In other words, prowess in athletics does not define a man in the same way that life does. However, whether by essence or accident, a being possesses substance. Life is possessed by a substance which in this case is a person. Similarly, the athletic capability cannot exist without a person as the substance. There are different modes of predicating a being. These are referred to as categories.
Categories
The mode of categories permits us to observe the concept of substance openly. Aristotle offers several categories of being including substance, quality, quantity, place, relation, position, time, action, state, and passivity (Marias, 2012). All these categories share ‘substance’ in common. Suppose one asks: “what is the height?” In such a case one may answer, ‘6 ft.’ as the height. Placing aside the correctness of the answer, it is right to say that ‘6 ft.’ falls under the category of quantity. However, without substance, the ‘6’ does not make sense. In this case, the substance is represented by the word ‘is’ in the question. ‘Is’ may represent a man, a tree, a pole, or any other substance. In a different example, one may ask: “where is it?” If the answer is “it is in class”, then class falls under the ‘place’ category. ‘Is’ on the other hand represents the substance, whether a book or pen. Hence, all these categories only possess meaning when they refer to substance.
True Beings and False Beings
Beings can either exist as true or false beings (Marias, 2012). The terms, in this case, are not applied in the commonly known sense. Instead of the common use of judgment to determine the trueness and falseness of terms, Aristotle refers to a specific thing. For instance, we may consider a common trend where a cake is baked to resemble objects such as a bottle. If we assume that great detail is put into the cake, then one might be convinced that it is a bottle at first glance. In such a case, the bottle is a false being as it shows a being other than its own. However, it is still a true being as a cake. Like in other modes, it is important to note that the beings described as true or false are substances.
The Potential and the Actual
Beings can either exist as potential or actual. Aristotle offers us several examples such as that of a seed (Marias, 2012). Although it is a seed in actuality, it has the potential to become a tree. The same case applies to a bird’s egg. The egg is the actual while the bird is the potential. The same case applies to a child who has the potential of becoming a man. Aristotle, therefore, asserts that entities have an actual and a potential mode. This is the concept underlying the principle of motion which allows for potential entities to be achieved. Notably, one cannot describe these modes without mentioning substances, which in this case, are seed and tree, egg and bird, and child and man.
As explained above, substances are common to the different modes of being. Hence, the concept is central to Aristotle’s metaphysics. The study of modes of beings correlates to the different modes of substances. A different point of approach to understanding substances is by studying the various theories of substance to grasp the concept better. One of these is the theory of matter and form.
Theory of Matter and Form
This theory explains the ontological structure of substance. Aristotle formulates it as a result of difficulties in classifying substances. One of the classes, the primary substances, is the individual things which are substances in the strictest sense such as a man, a tree, or a rock. The second class, secondary substances, is slightly problematic as it does not refer to individuals but instead to a collection. For instance, when one talks of trees in a general context, this does not refer to a separate thing. To clarify this issue, Aristotle explained that a substance is a compound of two elements: matter and form (Aristotle, 2013). Matter is defined as ‘what a thing is made of’ while form is ‘what makes the thing what it is.’ An example of a table is given, whereby the matter is wood, while the form is that of a table (Marias, 2012). Similarly if one considers a metal pole, the matter of the pole is metal and the form is that of a pole. This theory allows for the accounting of secondary substances such as species. Aristotle concludes that these are abstract ingredients of each separate thing. For instance, the species man is present in each individual man as the abstract form. Hence, they qualify as secondary substances.
Theory of Motion
This theory explains motions within substances. It was earlier stated that substances consist of the possibility of each thing. In different wording, substances consist of the principle of motion (Marias, 2012). Like in many terms used in Aristotle’s philosophy, ‘motion’ has a different meaning in this case from our everyday use. It is closely related to the potential and actual modes of being as earlier explained. Hence, substances have an actual form and a potential form that constitutes motion. An oak tree is the potential form of its seed. Hence a seed possesses motion. Aristotle cautions that such motion is subject to reality rather than pure possibilities. An oak seed can only become an oak tree and not an animal, for instance, once it experiences motion. The same case applies to an egg. Once it turns to a bird, then it has experienced motion. Hence, substances experience motion from one mode to another. The only exception to this rule is God, who is pure actuality and uniquely referred to as the unmoved mover.
Theory of the Causes
Through this theory, Aristotle makes substances to be known by their causes and principles. According to the theory, there are four causes of a substance. These include material, formal, efficient, and final causes (Marias, 2012). The material cause is the matter that a substance is made of. This was expounded in the theory of matter and form. The formal cause is also called the form. It determines the substance. The efficient cause is associated with the motion. It is the factor that initiates motion from the potential to actual substance. The final cause is the end substance or the purpose of the substance. If we consider the simple example of a table, then the material cause is the wood, the formal cause is the table, the efficient cause is a carpenter, and the final cause is also table. Notably, the formal and final causes coincide regularly. A different example is that of a pot. The material cause, in this case, is clay. The form is that of a pot while the efficient cause is the potter. Finally, the final cause is the pot.
Essence and Substance
Aristotle took his time to distinguish between essence and substance. The term essence is used when describing the different modes of being. Hence, as earlier mentioned, a substance or entity can possess being by essence or by accident. Life is an essence in man but life is not a substance. Aristotle feels the need to expound on this. He clarifies that essence is what makes it possible for substances to exist (Aristotle, 2013). We can go further and ask ourselves; what is the essence of man? Modern science has already established that man is closely related to other animals that are mammals. However, various things set him aside from such animals. These include rationality and the ability to speak. Hence man is made possible by his rationality. Consequently, it is correct to state that man’s essence is his rationality. Similarly, a plant’s existence is made possible by its ability to carry out photosynthesis. Hence, photosynthesis is the essence of plants. These examples show both the distinction and relationship between essence and substance. Essence makes it possible for a substance to exist.
God as the Absolute Substance
Various aspects of substance have been articulated including matter and form, motion, and causes. These aspects, however, introduce various problems. On the center stage is the problem of motion. If every substance consists of potential and actual mode, then events can be traced backward whereby we conclude that A was caused by B and B was caused by C and so on. If that’s the case, then we would keep moving back to infinity. Aristotle argues that this is impossible (Marias, 2012). Accordingly, there must have been a beginning to this motion. He refers to the beginning as God. God is pure actuality and the prime mover. This mover is neither moved nor does it move. Hence, God does not possess potentiality. However, this presents a second problem, that of matter and form. It was earlier indicated that a substance consists of matter and form. Matter is potential that actuates itself by adopting a form (Marias, 2012). But if God has no potentiality, then he cannot possess matter. Hence, God is pure form and also the absolute substance. Also, the Aristotelian God is absolutely self-sufficient and hence the highest entity. Since he is the prime mover, he makes it possible for the universe to exist. Consequently, it is important to distinguish him from the Christian God who is considered as the active creator of the universe.
Conclusion
Substance is central to Aristotle’s metaphysics. The different types of entities described by the philosopher have one thing in common; they are all substances. Hence, this calls for an understanding of several aspects including the different modes of being and the various theories outlined in his explanation of substance. Such theories are that of matter and form, the theory of motion and that of causes. Aristotle’s metaphysics culminates in the description of God as the plenary substance and absolute entity. Notably, the substance theory succeeded in laying the groundwork for other sciences such as physics and offers an alternative understanding of God from a logical point of view rather than a religious one.
References
Aristotle (2013). The Metaphysics. Courier Corporation.
Marias, J. (2012). History of Philosophy. Courier Corporation.