Galilei, Galileo, The systems of the world, 1661

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SIMPL. I ſee not yet any need that Ariſtotle hath of help,
ſtanding
as he doth ſtoutly and ſtrongly on his feet; yea not
ing
yet aſſaulted, much leſs foiled by you.
And what ward will
you
chooſe in this combate for this firſt blow? Aristotle writeth,

that
whatever is generated, is made out of a contrary in ſome
ſubject
, and likewiſe is corrupted in ſome certain ſubject from a

contrary
into a contrary; ſo that (obſerve) corruption and
neration
is never but onely in contraries; If therefore to a
leſtial
Body no contrary can be aſſigned, for that to the circular

motion
no other motion is contrary, then Nature hath done very
well
to make that exempt from contraries, which was to be
generable
and incorruptible, This fundamental firſt confirmed,
it
immediately followeth of conſequence, that it is
ble
, inalterable, impaſſible, and finally eternal, and a

tionate
habitation to the immortal Deities, conformable to the
opinion
even of all men that have any conceit of the Gods.
He

afterwards
confirmeth the ſame by ſenſe; in regard, that in all
times
paſt, according to memory or tradition, we ſee nothing
moved
, according to the whole outward Heaven, nor any of its

proper
parts.
Next, as to the circular motion, that no other is
contrary
to it, Aristotle proveth many ways; but without
ting
them all, it is ſufficiently demonſtrated, ſince fimple motions
are
but three, to the medium, from the medium, and about the
medium, of which the two right, ſurſum and deorſum, are
feſtly
contrary; and becauſe one onely hath onely one for
trary
, therefore there reſts no other motion which may be
ry
to the circular.
You ſee the ſubtle and moſt concluding
courſe
of Ariſtotle, whereby he proveth the incorruptibility of
Heaven
.
Ariſtotles diſcourſe
to
prove the
ruptibility
of
ven
.
Heaven an
tation
for the
ortal
Gods.

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