25. Now comes the question, equally calling for an answer, whether those souls that have quitted the places of earth retain memory of their lives- all souls or some, of all things, or of some things, and, again, for ever or merely for some period not very long after their withdrawal. A true investigation of this matter requires us to establish first what a remembering principle must be- I do not mean what memory is, but in what order of beings it can occur.