You have chosen 'Existentialism and Humanism' by Jean-Paul Sartre, 'On the True Doctrine (Against Christians)' by Celsus and 'Essays on Active Powers 1: Active power' by Thomas Reid
start again | choose another area for these texts | all the ideas for this combination of texts| All the ideas for Natural Theory, or select a subheading: |
| A. | Speculations on Nature | |
| B. | Natural Kinds | |
| C. | Causation | |
| D. | Laws of Nature |