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Tahafut_al-Tahafut-transl-Engl-van-den-Bergh

a book on philosophy

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temporal parts, in so far as they are infinite in number, is not a

philosophical principle; on the contrary they deny it most strongly, and only

the materialists affirm it. For the sum must consist either of a finite number

of transitory members or of an infinite number. If the former is the case, it

is generally admitted that the members must also be generically transitory.

For the latter case there are two theories. The materialists believe that the

totality is of a possible nature and that the collectivity must be eternal and

without a cause . The philosophers admit this infinity and believe that such

genera, because they consist of possible transitory constituents, must

necessarily have an external cause, lasting and eternal, from which they

acquire their eternity . It is not true either, as Ghazali seems to imply, that

the philosophers believe that the impossibility of an infinite series of

causes depends on the impossibility that the eternal should consist of an

infinity of constituents. They affirm that the eternity of these generically

different movements must lead to one single movement, and that the

reason why there exist genera which are transitory in their individuals, but

eternal as a whole, is that there is an existent, eternal partly and totally,

and this is the body of the heavens. The infinite movements are

generically infinite only because of the one single continuous eternal

movement of the body of the heavens. And only for the mind does the

movement of heaven seem composed of many circular movements. And

the movement of the body of the heavens acquires its eternity-even if its

particular movements are transitory-through a mover which must always

move and through a body which also must always be moved and cannot

stop in its motion, as happens with things which are moved in the

sublunary world.

About genera there are three theories, that of those who say that all

genera are transitory, because the individuals in them are finite, and that

of those who say that there are genera which are eternal and have no first

or last term, because they appear by their nature to have infinite

individuals; the latter are divided into two groups: those, namely the

philosophers, who say that such genera can only be truly said to be

everlasting, because of one and the same necessary cause, without which

they would perish on innumerable occasions in infinite time; and those,

namely the materialists, who believe that the existence of the individuals

of these genera is sufficient to make them eternal. It is important to take

note of these three theories, for the whole controversy about the eternity

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