"Let an Hypochondriack then have his park well stocked. Let him get as many agreeable ideas into his mind as he can; and though there may in wintery days seem: a total vacancy, yet when summer glows benignant, and the time of singing of birds is come, he will be delighted with gay colours and enchanting notes."
— Boswell, James (1740-1795)
(p. 158 in London Magazine)
See also James Boswell, The Hypochondriack, ed. Margery Bailey, 2 vols. (Stanford UP, 1928).