Memory is lazy.
A memory exists as a potential that is only actualized upon an act of evaluation, that is, upon the telling of a story.
A story is always an act, a memory always the potential for such an act; a text is a medium through which memory is actualized.
A story is expressed through the evaluation of a text, but a text is not a stimulus; rather it's a prism that refracts memory into stories.
Storytelling is inherently contingent, the writing of a new text.