Book,  Paragraph

 1   I,  2 |         simple body which revolves naturally and in virtue of its own
 2   I,  2 |      itself, but it cannot so move naturally, since there is one sort
 3   I,  2 |        primary. For the perfect is naturally prior to the imperfect,
 4   I,  2 |          belongs to the body which naturally prior, and circular movement
 5   I,  3 |         term "heavy" to that which naturally moves towards the centre,
 6   I,  3 |         light" to that which moves naturally away from the centre. The
 7   I,  3 |          or lightness. For neither naturally nor unnaturally can it move
 8   I,  3 |    certainly does not belong to it naturally, since one sort of movement
 9   I,  3 |    downward direction. For neither naturally nor unnaturally can it move
10   I,  6 |            it, since the one moves naturally away from the centre and
11   I,  7 |          did, it would move either naturally or by constraint: and if
12   I,  7 |           If then that which moves naturally can also move unnaturally,
13   I,  7 |           A thing must move either naturally or unnaturally, and the
14   I,  8 |           all things rest and move naturally and by constraint. A thing
15   I,  8 |          constraint. A thing moves naturally to a place in which it rests
16   I,  8 |      without constraint, and rests naturally in a place to which it moves
17   I,  8 |            of the bodies will move naturally away from the centre and
18   I,  8 |        then, in another world move naturally also to our centre and its
19   I,  8 |       earth of our world must move naturally away from the centre when
20   I,  8 |          which earth and fire move naturally. For in general that which
21   I,  9 |            that which lies lowest. Naturally they could not be there,
22   I,  9 |           for it will do so either naturally or unnaturally, and will
23  II,  3 |            of a pair of contraries naturally exists, the other, if it
24  II,  3 |       really contrary, exists also naturally. In some form it must be
25  II,  3 |     movement cannot be regarded as naturally eternal: and these bodies
26  II,  4 |       since in any kind the one is naturally prior to the many and the
27  II,  4 | starting-point the fact that water naturally tends to collect in a hollow
28  II,  13|           The difficulty then, has naturally passed into a common place
29  II,  13|            can they think that the naturally lighter substance lies below
30  II,  13|          the whirl. But if fire is naturally such as to move in a certain
31  II,  13|         the place to which a thing naturally moves, it will naturally
32  II,  13|           naturally moves, it will naturally rest. The reason then is
33  II,  14|            point to which the part naturally moves. Since, then, it would
34  II,  14|          which possesses weight is naturally endowed with a centripetal
35  II,  14|           movement towards what is naturally spherical. Either then the
36  II,  14|        spherical or it is at least naturally spherical. And it is right
37 III,  1 |          unchanging entities, they naturally transferred what was true
38 III,  2 |      movements, is always one. For naturally a thing moves in one way,
39 III,  2 |         rest not by constraint but naturally. But a natural rest proves
40 III,  2 |       motion not by constraint but naturally. If there is no ultimate
41 III,  6 |        absence of constraint, i.e. naturally. If, then, it is in a place
42  IV,  1 |           the power of being moved naturally in a certain way. The activities
43  IV,  3 |        some bodies move always and naturally upward and others downward,