The final part of Crusius’ metaphysics consists of what he calls pneumatology, that is, a study of finite substances that can not just move, but also think and will. Crusius notes that no matter what the world is like, it must contain such substances - they are supposed to be the purpose of the world - thus, pneumatology should be included in a metaphysical cosmology. Once again, pneumatology should study only the necessary properties of these substances, not those dependent on the contingent features of the world.
Despite emphasising the apriority of pneumatology, Crusius begins with an empirical study of activities we find in our mind. We perceive in us thoughts, he starts. Some thoughts we have while we are awake and they represent what is immediately present to us: these are what is in German called Empfindung - a word that could be translated, depending on the context, as sensation or as feeling. Whatever the translation, Crusius classifies these sensations or feelings into external - those representing a thing outside us with the help of sense organs - and internal - those representing the thing that thinks in us. Through the inner sensation or feeling, Crusius states, we are conscious of ourselves, of our thoughts and of our state of mind.
Crusius goes on describing further capacities of thinking we have. These include memory – a capacity to return to thoughts we once had and thus represent things we sensed, although they are now absent – imagination – capacity to move from one thought to another – abstraction – capacity to divide thoughts into their constituents, for instance, to think of a subject without its properties – capacity to make propositions, that is, to note relations between thoughts, and a capacity to make deductions. These capacities, Crusius notes, are all explained in terms of thoughts or representations, which is a fundamental concept that cannot be explained further.
In addition to thinking, Crusius continues, we find in ourselves something else. We are pleased when we achieve something we want, and we feel pain when we face something we wanted to avoid. We also note that we can control our thoughts, our body and even our desires. All of these, Crusius says, show that we have will, that is, a force of acting according to our representations. Willing presupposes thinking, since we need to have representations, before we can will, Crusius adds, but mere thinking is still not enough for willing. Willing is hence something more than thinking, but this something more cannot be defined.
In addition to thinking and willing, we also have a notion of moving, Crusius says, since we can both see things outside us move and we can move ourselves and our body. Furthermore, he at once adds, we immediately know that movement is something different from thinking and willing and cannot be even their cause. This basic fact, guaranteed by very clear inner feeling, Crusius insists, is the only proof we need against materialism: thinking and willing are not mere movement of matter. No matter how fine the matter is, Crusius states, it can never think or will anything.
Crusius suggests that the central confusion that makes one believe in materialism is that the word “representation” suggests that a thought is like a concrete picture in the brain. He notes that the same confusion can be found also with anyone endorsing Leibnizian pre-established harmony, which states that any representation in the soul corresponds to a material idea in the brain. Crusius argues that a machine could not change pictures as rapidly as we change from one thought to another. Furthermore, he notes that no machine could store pictures for as long a time as our memory does. Indeed, he adds, the brain would soon be filled, if we had to insert pictures in it any time we have thoughts. Abstract ideas especially appear to be such that could never be represented materially. And if no other argument works, Crusius concludes, we can always note that materialism would destroy the freedom of our will and thus make morality and religion impossible.
In addition to this fundamental confusion, Crusius considers other arguments of materialists that he considers fallacious. Most of these involve the obvious fact that the body appears to affect our state of mind, for instance, that a physical sickness makes it difficult to think. Crusius’ answer is that these effects can as well be explained by the close interaction of the spirit and the body.
Crusius notes further that materialists apply arguments involving biology: they state that supposedly thinking and willing beings (e.g. worms) can come out of rotting meat and that parts of worms can still continue their movement when cut apart. The first argument Crusius deals very quickly: worms are not spontaneously generated by the rotting meat, but very small eggs of worms just grow faster, when coming in contact with the warmth and moisture of rot meat. In the case of the second argument, Crusius just points out our ignorance on why the worms can do this - perhaps the movement of a dissected worm is just a mechanical reflex that does not require free will.
In addition to speaking so fervently against materialism, Crusius is eager to state that it is not materialistic to assume that thinking and willing substances can move things. Thinking and willing substance can be spatial and impenetrable, because these characteristics do not form the essence of material things. Some things in the world - like stones - have only a capacity to move, while we humans can move, but also think and will.
Thinking and willing are characteristic not just of humans, Crusius says, but other organic bodies appear also to move as guided by a thinking and willing substance. These organic bodies must also have such a guiding substance or soul, Crusius insists. Together, the soul and the body form an animal, and we humans are then the most perfect animals. Crusius is certain that thinking substances, both those of humans and those of other animals, can exist without being connected to a body. Then these substances just shouldn’t be called souls, but spirits (Geist). Even God could be called spirit, since God can think and will, although not move.
We have already noted that a willing substance must think, but must every thinking substance also have a will? Crusius admits that this is technically a possibility. Yet, from a wider perspective, such merely thinking substances cannot exist. God does nothing without purpose, and what purpose would such a non-willing thinker have? In other words, Crusius appears to say, thinking is done in order to help willing – for instance, in choosing the right means for achieving what we want – and mere thinking by itself would not be enough.
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