
250
Natural philosophy
society.
Religion was, of course, destined to change, but according to
rhythms not determined by man. There was also the problem of the
immortality of the soul and of free
will,
the latter thrown into disarray by
the very astrology Cardano had, in his commentary on Ptolemy's
Tetrabiblos
(1554),
set
himself
to restore. The appeal to astrology underlines
another salient feature of Cardano's philosophy. He was no longer willing
to accept the authority of Aristotle and Galen in physics and medicine, and
was
a champion of the indispensable role of experience, even if always
subject to rational verification; his
view
of
nature
oscillated between the
extreme simplicity of the principles needed to account for all living
processes — basically, warmth and moisture — and the immense variety of
phenomena which had to be explained in terms of these principles. He
stressed the determinant importance of celestial warmth as the agent in
every
process of generation, sufficient even to account for the spontaneous
generation of man, if not for his highest intellectual processes. This led him
into cosmological problems. Almost sarcastically hostile to Copernicanism,
he tended not only to emphasise the decisive role
of
celestial
heat but also to
question the Aristotelian notions about
matter
and movement
that
enforced
the rigid separation of celestial and sublunary events.
Cardano, too, sought in the heavens the explanatory key for religious and
historical changes in the human world. He saw himself as the learned man
destined to perfect, or at least to advance, many branches
of
knowledge
by
raising them to a higher
level
beyond rational explanation. When he
encountered the metaphysical restrictions mentioned above, he did not
hesitate to invoke a higher inspiration which guided him into the realm of
mysticism and which was mysterious and enigmatic, even to those whom it
guided.
BERNARDINO
TELESIO
Telesio
was less wide-ranging
than
Cardano and more closely involved
with anti-Aristotelian criticism. The first version, in two books, of his De
rerum
natura iuxta propria principia
appeared
in
1565.
It is
livelier
but
less
organised and effective
than
the definitive 1586 version in nine books.
9
It
begins with the works of Aristotle, criticising Peripatetic cosmology
precisely
at the moment when the senses (and therefore direct experience)
were being claimed as the principal criterion for our evaluation of reality.
9.
Sertorio
Quattromani
produced
a
synthesis
of
Telesio's
philosophy
in
Italian,
first
published
in
Naples
in 1589; see
Quattromani
1914.
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