
Quote from Gainsborough's letter to his friend William Jackson of Exeter, from Bath, 11 May 1768; as cited in Thomas Gainsborough, by William T, Whitley https://ia800204.us.archive.org/6/items/thomasgainsborou00whitrich/thomasgainsborou00whitrich.pdf; New York, Charles Scribner's Sons – London, Smith, Elder & Co, Sept. 1915, p. 383 (Appendix A - Letter VI)
1755 - 1769