John Wesley and Miss Bishop, resident near Bath, first struck up a correspondence over Miss Bishop's faith in 1769. By 1774, Wesley and Miss Bishop knew each other well; they had been in regular correspondence about the Methodist Society in Bath and personal affairs, and they had met a number of times in Bath.
In this personal letter written on June 26th 1777 from near London, Wesley writes of Miss Bishop's recent illness, and that "It is not probable that you will be able to teach School any more, as it implies breathing so long in a confined air and speaking several hours in a day." However, Wesley was encouraging her to meet with the Bristol class of the Methodist Society once better. By this time, they had known each other and corresponded regularly by letter for over eight years.
See also the other letters written by John Wesley to Miss Bishop in the Online Collection.