A conscientious and eloquent minister, he became pastor of the
Old South Church in
Boston in 1766. While traveling to Boston, he survived a shipwreck but became ill and lost his possessions including the sermons he had written. In the spring of 1769, he traveled to Philadelphia and became severely ill, believing he would not recover. Because of his poor health, and conflict with his church members regarding the
Half-Way Covenant, he resigned and was dismissed on October 10, 1769. He then moved to
Germantown, Pennsylvania. During the
American Revolutionary War, he was a chaplain of the
Continental Army from 1775 until June 20, 1780. His rank as an officer made him eligible for membership in the
Society of the Cincinnati. He was appointed the second
Chaplain of Congress on December 10, 1790, a position he held for two years, until he was replaced by
Ashbel Green on November 5, 1792. Blair was a member of the
American Philosophical Society (elected in 1797) and died in Germantown in September 1818. ==Family==