"'Solitude,' added he one day, 'is dangerous to reason, without being favourable to virtue: pleasures of some sort are necessary to the intellectual as to the corporeal health; and those who resist gaiety will be likely for the most part to fall a sacrifice to appetite; for the solicitations of sense are always at hand, and a dram to a vacant and solitary person is a speedy and seducing relief.'"
— Piozzi, [née Salusbury; other married name Thrale] Hester Lynch (1741-1821)
Hester Lynch Piozzi, Anecdotes of the Late Samuel Johnson, L.L.D. During the Last Twenty Years of his Life (London: T. Cadell, 1786). <Link to ESTC><Link to Google Books>
See also Anecdotes of the Late Samuel Johnson, L.L.D. During the Last Twenty Years of his Life. 4th edition. (London: Cadell, 1786). <Link>