Descartes presented the Memory response against the cartesian circle. Descartes assumed the reliability of intuition all along. The doubt he laid to rest by proving God's existence is one of memory: after doing that he could be certain that what he remembered as having perceived clearly and distinctly is true.
But don't we need memory to think? How can a person think without having memory? Let me present an example:
- All the eagles present currently in the world were born.
- All the cockroaches present currently in the world were born.
- Therefore, eagles and cockroaches are similar in that regard.
Consider the placeholder argument above. To reach the conclusion (point 3), one must remember points 1 and 2. So, if the reliability of memory has not been ascertained, how can the reliability of intuition be ascertained as thinking/intuiting is completely dependent on memory? How are the reliability of memory and the reliability of intuition independent of each other?