the mind > mental capacity > memory > retrospection, reminiscence > [noun] > old memories > longing for the past (3)
Nostalgia; an instance of this.
Sentimental longing for or regretful memory of a period of the past, esp. one in an individual's own lifetime; (also) sentimental imagining or…
Excessive reverence for the past; nostalgia. Frequently used in explicit contrast to futurism.