You have chosen 'On Duties ('De Officiis')' by M. Tullius Cicero, 'A Universe from Nothing' by Lawrence M. Krauss and 'On the True Doctrine (Against Christians)' by Celsus
start again | choose another area for these texts | all the ideas for this combination of texts| All the ideas for Existence, or select a subheading: |
| A. | Nature of Existence | |
| B. | Change in Existence | |
| C. | Structure of Existence | |
| D. | Theories of Reality | |
| E. | Categories |