Bernardino
Telesio (1509 – 1588) was an Italian philosopher and natural
scientist. Opposing the Aristotelianism which characterized medieval
scholarship, he developed an empirical approach to natural philosophy
and treated it as a separate field of study from theology and
metaphysics. He abandoned the purely intellectual sphere and proposed
an inquiry into the data given by the senses, from which he held that
all true knowledge really comes. Telesio avoided Aristotle’s
separation of the corruptible earth from the eternal heavens and
regarded all matter as affected by two opposing elements of force:
heat, which expands, and cold, which contracts. His system was a
forerunner of subsequent empiricism, scientific and philosophical,
and his famous work, De Rerum Natura Iuxta Propria Principia (On the
Nature of Things according to their Own Principles), marked the
period of transition from Aristotelianism to modern thought. Telesio
inspired Tommaso Campanella and Thomas Hobbes, and sowed the seeds of
the scientific method employed by Bruno, Bacon and Descartes. His
anti-Aristotelianism aroused the anger of the Roman Catholic Church,
and a short time after his death in 1588, his books were condemned
and placed on the Index.
Life
Bernardino
Telesio was born of noble parentage at Cosenza, a town in Calabria, a
region of Southern Italy. He was educated at Milan by his uncle,
Antonio, himself a scholar and an eminent poet, and afterwards at
Rome and Padua. His studies included the Renaissance curriculum of
classics, science, and philosophy. Telesio began an attack upon the
medieval Aristotelianism which then flourished in Padua and Bologna.
Resigning to his brother the archbishopric of Cosenza, offered to him
by Pope Pius IV, he began to lecture at Naples and finally founded
the academy of Cosenza. In 1563, or perhaps two years later, appeared
his great work De Rerum Natura Iuxta Propria Principia (On the Nature
of Things according to their Own Principles), which was followed by a
large number of scientific and philosophical works of subsidiary
importance. The heterodox views which he maintained against
Aristotelianism aroused the anger of the Roman Catholic Church, and a
short time after his death in 1588, his books were condemned and
placed on the Index.
Thought
and Works
Telesio
was the head of the great South Italian movement which protested
against the accepted authority of abstract reason, and sowed the
seeds from which sprang the scientific methods of Campanella and
Bruno, and of Bacon and Descartes, with their widely divergent
results. Telesio developed an empirical approach to natural
philosophy, which he regarded as a separate field of study from
metaphysics and theology. He abandoned the purely intellectual sphere
and proposed an inquiry into the data given by the senses, from which
he held that all true knowledge really comes. Instead of postulating
matter and form, he based existence on matter and force. He believed
that all natural beings were animate, and he avoided the Aristotelian
separation of corruptible earth from the eternal heavens. Instead, he
regarded all matter as affected by two opposing elements of force:
heat, which expands, and cold, which contracts. These two processes
accounted for all the diverse forms and types of existence, while the
mass on which the force operated remained the same. The whole was
harmonized by the concept that each separate thing develops in and
for itself in accordance with its own nature, while at the same time
its motion benefits the rest. The obvious defects of this theory, (1)
that the senses alone cannot apprehend matter itself, (2) that it is
not clear how the multiplicity of phenomena could result from these
two forces, and (3) that he adduced no evidence to substantiate the
existence of these two forces, were pointed out at the time by his
pupil, Patrizzi.
His
theory of the cold earth at rest and the hot sun in motion was doomed
to disproof at the hands of Copernicus, but was at the same time
sufficiently coherent to make a great impression on Italian thought.
When Telesio went on to explain the relation of mind and matter, he
was still more heterodox. Material forces are, by hypothesis, capable
of feeling; matter also must have been from the first endowed with
consciousness, for consciousness exists, and could not have been
developed out of nothing. This led him to a form of hylozoism. The
soul is influenced by material conditions; consequently the soul must
have a material existence. He further held that all knowledge is
sensation ("non ratione sed sensu") and that intelligence
is, therefore, an agglomeration of isolated data, given by the
senses. He did not, however, succeed in explaining how the senses
alone could perceive difference and identity. At the end of his
scheme, probably in deference to theological prejudices, he added an
element which was utterly alien, namely, a higher impulse, a soul
superimposed by God, in virtue of which we strive beyond the world of
sense.
Besides
De Rerum Natura, he wrote De Somno, De his guae in acre fiunt, De
Mari, De Comelis et Circulo Lactea, De usu respirationis, and other
works.
Influence
The
whole system of Telesio showed lacunae in argument, and ignorance of
essential facts; nevertheless it was a forerunner of all subsequent
empiricism, scientific and philosophical, and marked clearly the
period of transition from authority and reason, to experiment and
individual responsibility. Telesio became the head of a school in
Calabria, and his ideas were widely read and discussed during his own
time. Though he opposed Aristotelianism, he drew many ideas from him
and tried to transform, rather than undermine, Aristotle’s
teachings. Tommaso Campanella followed Telesio in his early writings,
and Thomas Hobbes was inspired by him.
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