"If impressions are made upon some substance in the mind, may not forgetfulness of them be only that the perceptive faculty of the soul is turned to other objects, while these still remain ready to be perceived whenever the 'mind's eye,' glances upon them?"
— Boswell, James (1740-1795)
(p. 158 in London Magazine)
See also James Boswell, The Hypochondriack, ed. Margery Bailey, 2 vols. (Stanford UP, 1928).