"When we talk of a storehouse of our ideas, we are only forming an imagination of something similar to an enclosed portion of space in which material objects are reposited. But who ever actually saw this storehouse, or can have any clear perception of it when he endeavours by thinking closely to get a distinct view, of it?"
— Boswell, James (1740-1795)
(pp. 156-7 in London Magazine)
See also James Boswell, The Hypochondriack, ed. Margery Bailey, 2 vols. (Stanford UP, 1928).