It is interesting to notice that some central ideas of Crusius’ philosophy are based on the work of his teacher, Hoffman, who, for instance, invented the notion of thelematology or study of human will, the topic of the first book of Crusius we have studied. Crusius’ work Entwurf der notwendigen Vernunftwahrheiten, wiefern sie den zufälligen entgegengestellt werden also starts with a very Hoffmanian notion: metaphysics is a study of necessary truths, both of those which are necessary as such and those which are necessary, if we assume or posit the existence of a world. He does exclude some necessary truths from the realm of metaphysics: those of practical philosophy, where necessary and contingent truths are difficult to distinguish, and those of mathematics, which are simply too numerous.
Crusius’ definition might seem rather uninteresting: after all, Kant said that this had been the idea behind traditional metaphysics. Yet, once we look at e.g. Wolff, we see him defining metaphysics through certain topics and even including such disciplines as empirical psychology in it. Indeed, it seems more likely that Kant was accustomed to the way metaphysics was defined in Hoffmanian tradition - more specifically, he had read Crusius - and now just transmitted this idea further.
Although Crusius speaks against defining metaphysics through its topics, he does divide it in accordance with them. We are probably not surprised to find ontology and natural theology as parts of metaphysics, and by speaking of metaphysical cosmology, Crusius appears to just want to restrict the traditional discipline of cosmology to necessary truths and exclude e.g. laws of movement. A more unexpected name on the list is the so-called metaphysical pneumatology. It roughly plays the same role as psychology in Wolff’s metaphysics. Yet, unlike psychology, pneumatology is said to study only the necessary essence of spirits. What is especially missing is an account of the human soul and its relation to body, since it is not necessary that there are embodied spirits.
Although necessity is then an important feature of metaphysics for Crusius, this does not mean that he would want everything in it to be demonstrated. In other words, he distinguishes between necessity in an ontological sense from certainty. This means that even mere proofs of probability suffice, if demonstrations are not available. Indeed, Crusius adds, they might be even needed, when the demonstrations are available, because common people might not be prepared for the intricacies of complex demonstrations.
I shall still deal in this post with some general facts about the first part of metaphysics or ontology, leaving more precise details of Crusius’ ontology and the other parts of his metaphysics to further posts. The topic of ontology, for Crusius, is the most general features of all things. This means, he explains, that whatever things were given, a keen mind could discern the whole ontology from them. Indeed, he says more generally, whatever the topic of a metaphysical discipline, we could in principle discern everything of that discipline from an instance of that topic.
Ontology, Crusius explains, must then deal with the simplest concepts possible. This simplicity is not the same as simplicity in what we can sense, such as the simplicity of colours, which we can distinguish from one another without being able to explain their difference. Such sensuous simples are only simple, he adds, because we haven’t yet been able to analyse them further. The ontological simples, on the other hand, are the result of an analysis, and we know we cannot analyse them further. Still, we can distinguish even these ontological simples, because they play different roles in the analysis of complex things.
Next time, I shall begin a study of one of these simple concepts, namely, the notion of a thing.
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