The young pastor, Thomas Lister, died when he was just 27. He died as pastor in the same city that Robert M McCheyne died when he was just 29. In the first dialogue, the pastor – Robert Shirra, 1724-1803, discovers that the young pastor is completely without assurance of salvation and is convinced that he is but a hypocrite. By the end of the 7th dialogue, he died in the full assurance of his faith, but anxious for his church that he only lived to pastor for 4 years. The counsel of Robert Shirra is so encouraging, edifying, and theologically sound.
The biography and remains of Robert Shirra can be found online.