6 R. Do any corporeal, that is, sensible things, appear to you to be capable of comprehension in the intellect? A. They do not. R. What then? Does God appear to use senses for the cognition of things? A. I dare affirm nothing unadvisedly concerning this matter; but as far as there is room for conjecture, God in no wise makes use of senses. R. We conclude therefore that the only possible subject of sense is the soul. A. Conclude provisionally as far as probability permits. R. Well then; do you allow that this wall, if it is not a true wall, is not a wall? A. I could grant nothing more willingly. R. And that nothing, if it be not a true body, is a body? A. This likewise. R. Therefore if nothing is true, unless it be so as it seems; and if nothing corporeal can appear, except to the senses; and if the only subject of sense is the soul; and if no body can be, unless it be a true body: it follows that there cannot be a body, unless there has first been a soul. A. You urge me too strongly, and means of resistance fail me.
Source: Soliloquies (New Advent)