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On Generation and corruption   

place allotted to it by the Order.

It is clear from what has been said (i) that coming-to-be and

passing-away actually occur, (ii) what causes them, and (iii) what

subject undergoes them. But (a) if there is to be movement (as we have

explained elsewhere, in an earlier work') there must be something

which initiates it; if there is to be movement always, there must

always be something which initiates it; if the movement is to be

continuous, what initiates it must be single, unmoved, ungenerated,

and incapable of 'alteration'; and if the circular movements are

more than one, their initiating causes must all of them, in spite of

their plurality, be in some way subordinated to a single

'originative source'. Further (b) since time is continuous, movement

must be continuous, inasmuch as there can be no time without movement.

Time, therefore, is a 'number' of some continuous movement-a 'number',

therefore, of the circular movement, as was established in the

discussions at the beginning. But (c) is movement continuous because

of the continuity of that which is moved, or because that in which the

movement occurs (I mean, e.g. the place or the quality) is continuous?

The answer must clearly be 'because that which is moved is

continuous'. (For how can the quality be continuous except in virtue

of the continuity of the thing to which it belongs? But if the

continuity of 'that in which' contributes to make the movement

continuous, this is true only of 'the place in which'; for that has

'magnitude' in a sense.) But (d) amongst continuous bodies which are

moved, only that which is moved in a circle is 'continuous' in such

a way that it preserves its continuity with itself throughout the

movement. The conclusion therefore is that this is what produces

continuous movement, viz. the body which is being moved in a circle;

and its movement makes time continuous.


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