Book, Paragraph

 1  II, 3 |         other reciprocally, e.g. hard work causes fitness and
 2 III, 2 |    incomplete. This is why it is hard to grasp what motion is.
 3 III, 2 | actuality of the kind described, hard to grasp, but not incapable
 4  IV, 4 |          something important and hard to grasp, both because the
 5  IV, 9 |       for both the heavy and the hard are thought to be dense,
 6  IV, 10|    always other and other? It is hard to say.~(1) If it is always
 7   V, 2 |        fact, what we describe as hard to move; and in the third
 8 VII, 3 |        wax being dry or fluid or hard or hot.~And not only so:
 9 VIII, 3|         mean all kinds, it is no hard matter to reply to them:
10 VIII, 7|        heavy and light, soft and hard, hot and cold, are considered