| Paragraph 1 | We are seeking the principles and the causes of the things that are, and obviously of them qua being. |
| Paragraph 2 | And since natural science, like other sciences, is in fact about one class of being, i.e. to that sort of substance which has the principle of its movement and rest present in itself, evidently it is neither practical nor productive. |
| Paragraph 3 | That physics, then, is a theoretical science, is plain from these considerations. |
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created 1996/11/25 modified 2009/04/26