Schopenhauer accepts from Kant that space, time, and causality are
necessary and universal forms of every object, intuited in our conscious-
ness prior to any experience. Space and time are a priori forms of sensibility,
and causality is an a priori form of understanding. Understanding (Verstand)
is not peculiar to humans, because other animals are aware of relations
between cause and effect. Understanding is what turns raw sensation into
perception, just as the rising sun brings colour into the landscape. The
faculty that is peculiar to humans is reason (Vernunft), that is to say the
ability to form abstract concepts and link them to each other. Reason
confers on humans the possibility of speech, deliberation, and science; but
it does not increase knowledge, it only transforms it. All our knowledge
comes from our perceptions, which are what constitute the world.
The thesis that the world exists only for a subject leads to paradox.
Schopenhauer accepted an evolutionary account of history: animals existed
before men, fishes before land animals, and plants before fishes. A long series
of changes took place before the first eye ever opened. Yet, according to the
thesis that the world is idea, the existence of this whole world is forever
dependent on that first eye, even if it was only that of an insect.
Thus we see, on the one hand, the existence of the whole world necessarily
dependent on the first knowing [conscious] being, however imperfect it be; on the
other hand, this first knowing animal just as necessarily dependent on a long
chain of causes and effects which has preceded it, and in which it itself appears as
a small link. (WWI 30)
This antinomy can be resolved only if we move from consideration of the
world as idea to the world as will.
The second book of The World as Will and Idea begins with a consideration
of the natural sciences. Some of these, such as botany and zoology, deal
with the permanent forms of individuals; others, such as mechanics and
physics, promise explanations of change. These offer laws of nature, such as
those of inertia and gravitation, which determine the position of pheno-
mena in time and space. But these laws offer no information about the
inner nature of the forces of nature—matter, weight, inertia, and so on—
that are invoked in order to account for their constancy. ‘The force on
account of which a stone falls to the ground or one body repels another is,
in its inner nature, not less strange and mysteriou s than that wh ich
produces the movements and the growth of an animal’ (WWI 97).
METAPHYSICS
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