Full Idea
Memory does not consist in preserving images. It is a faculty of reproducing the conceptions with which our soul has been occupied.
Gist of Idea
Memory is not conserved images, but reproduction of previous thought
Source
Porphyry (Launching Points to the Realm of the Mind [c.280], 5Enn6 25(2))
Book Reference
Porphyry: 'Launching Points to the Realm of the Mind', ed/tr. Guthrie,Kenneth [Phanes 1988], p.44