Memory is a glorious and admirable gift  of nature by which we recall past things, we embrace present things, and we contemplate future things through their likeness to past things.

Natural memory comes soley from the gift of nature, without aid of any artifice.

Artificial memory is the auxiliary and assistant of natural memory…artficial from ‘art’ becasue it is found artificially through subtlety of mind

Boncompagno da Signa, Bologna, 1235