Some readers might remember that I was rather charmed by Lange's habit of beginning the philosophy of
history from biblical times. Well, the same trick does not work as
well the second time, hence, I was somewhat dissapointed by the
author's insistence that true physics could be found in Genesis and
that the further development of philosophy mostly ruined this
fabulous start.
The similarity is not accidental,
because the obscure author of Physica divina,
Andreas Rüdiger, belonged to the same loose circle of philosophers
as Lange. Both Rüdiger and Lange were Thomasians, named by their
affiliation to Christian Thomasius, first-ever philosopher to write in
German. And like Lange, Rüdiger also spent a great deal of his time
for criticising Wolff's philosophy, as we shall see in the future.
As the title
indicates so well, Rüdiger's book is aimed against both superstition
and atheism: superstition divinises the natural world and atheism
gets rid of the divine altogether, and the task is to stick with God,
but not confuse him with the natural world. True, the book also
contains nowadays rather quaint sounding physical theories, which
concern all the questions of contemporary natural science – the
nature of space, time and motion, movements of planets and stars,
basic elements and their combinations, meteorological phenomena,
magnetism, plants and animals. But Rüdiger is not satisfied with
expounding his own theories, but he also criticises theories of
earlier philosophers and shows how his own ideas can help to refute
both two extremes.
Most of Rüdiger's
enemies are easy to guess: Aristotle and atomists. But the inclusion
of Descartes as one of the enemies is somewhat surprising,
considering Lange's appreciation of the French philosopher. Yet,
Rüdiger's view on Descartes reveals that he understood the
implications of Cartesian and generally the modern natural science.
In a Cartesian world view, the material things move each other
mechanically, through push and pull. The nearest explanation of an
event involving material things is another event with other material
things. No God is therefore needed, because the eternal movement of
matter is enough for explaining the continuance of the movement of
matter, and Cartesian physics opens in this way a door to atheism.
Rüdiger's views on
Descartes bear a striking resemblance to Jacobi's idea of all modern,
mechanistic philosophy leading to atheism, but even more interesting
is Rüdiger's idea why Descartes had to fail. The main mistake
Descartes made, Rüdiger suggests, is the overt mathematization of
physics. Mathematics is a science of possibilities, Rüdiger states.
This might be a quip against Wolff, who had stated that philosophy is
the science of possibilities. For Rüdiger philosophy is instead the
science of what there actually is.
Whereas
possibilities meant for Wolff mainly the actual capacities for
generating things – real definitions – the possibilities of
Rüdiger refer mainly to mere nominal definitions, that is, to mere
words which might have no actual reference. In mathematics we can
just put together descriptions without any consideration as to
whether they describe anything that could be actual. Indeed,
mathematics, says Rüdiger, is at least partially false: nowadays we
might say that mathematics idealises and hence abstracts from certain
characteristics of the actual world. Just because mathematics is an
idealised picture of the world, it cannot grasp the true physics.
Rüdiger's idea
that mathematics and philosophy are two completely separate
disciplines is something that the later German philosophers agreed with:
for instance, Hegel made fun of philosophers who tried to use
mathematical method, although it was completely unsuitable for
philosophical purposes. Interestingly, Kant admits the difference of
the two disciplines, but for almost completely opposite reasons than
Rüdiger. For Kant, philosophy is the discipline that can only
analyse the meanings of concepts, but it cannot construct them –
that is, philosophy does not have the means to actualise its
concepts, while mathematician can draw his figures at least in pure
intuition.
Rüdiger also
argues that mathematization of philosophy eventually makes Cartesian
proofs for the existence of God futile: Descartes starts by assuming
the nominal definition of God, which is completely ineffective in
stating anything about what there actually is. Rüdiger's criticism
is reminiscent of Kant's later comment that concept of God as such
does not involve existence, although ontological proof attempts to
deduce one from the other. Rüdiger's further comments that Cartesian
mistake is repeated by Spinoza who just assumes the definition of
substance as something completely independent of anything else –
without noting that such definition might not make sense, because we
cannot generate anything corresponding to it: a similar criticism
against Spinozan definitions is later voiced by Hegel.
I think that this
will suffice for Rüdiger's Physica. Even if I found it
philosophically valuable to investigate his theories of air and
aether as the basic elements, I would still be in a hurry to move
beyond mere physics. That's right, next time I shall begin to do some
serious philosophy and tackle the first ever German book on
metaphysics.
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