Book,  Paragraph

 1   I,  9 |       must, however, return and ask how much of this argument
 2   I,  11|          This being so, we must ask what we mean by "possible"
 3  II,  5 |      eternal. We must therefore ask why this motion takes one
 4  II,  13|          It is strange, too, to ask about things staying still
 5 III,  1 |       first question we have to ask: is generation a fact or
 6 III,  2 |             but in that case we ask, where would it have moved
 7 III,  3 | constituents of bodies, we must ask which of such bodies are
 8  IV,  1 |     heavy" and "light". We must ask what the bodies so called
 9  IV,  3 |        form to matter.) Thus to ask why fire moves upward and
10  IV,  3 |      downward is the same as to ask why the healable, when moved