Thomas Campbell, a Presbyterian minister who becomes prominent during the Second Great Awakening of the United States, dies on January 4, 1854. Born in County Down, he begins a religious reform movement on the American frontier. He is joined in the work by his son, Alexander. Their movement, known as the “Disciples of Christ,” merges in 1832 with the similar movement led by Barton W. Stone to form what is now described as the American Restoration Movement (also known as the Stone-Campbell Restoration Movement).

Campbell is born on February 1, 1763, in County Down, Ireland (now Northern Ireland), and is raised as an Anglican. He is ordained a minister in the Scottish Seceder Presbyterian Church sometime after graduating from the University of Glasgow in 1786. He leaves Ireland for the United States in April 1807. This move is prompted by the advice of his physician. Once in America, disagreement arises between him and other Presbyterians over certain points related to Calvinist doctrine and the administration of the Eucharist.

The Campbell wing of the movement is launched when Campbell publishes the Declaration and Address of the Christian Association of Washington in 1809. The Presbyterian Synod had suspended his ministerial credentials. In the Declaration and Address he sets forth some of his convictions about the church of Jesus Christ, as he organises the Christian Association of Washington, in Washington County, Pennsylvania, not as a church but as an association of persons seeking to grow in faith. On May 4, 1811, the Christian Association reconstitutes itself as a congregationally governed church. With the building it constructs at Brush Run, Pennsylvania, it becomes known as Brush Run Church.

When their study of the New Testament leads the reformers to begin to practice baptism by immersion, the nearby Redstone Baptist Association invites Brush Run Church to join with them for the purpose of fellowship. The reformers agree, provided that they will be “allowed to preach and to teach whatever they learned from the Scriptures.”

Thomas and his son, Alexander, work within the Redstone Baptist Association during the period 1815 through 1824. While both the Campbells and the Baptists share practices of baptism by immersion and congregational polity, it is soon clear that the Campbells and their associates are not traditional Baptists. Within the Redstone Baptist Association, some of the Baptist leaders consider the differences intolerable when Alexander Campbell begins publishing a journal, Christian Baptist, which promotes reform. The Campbells anticipated the conflict and move their membership to a congregation of the Mahoning Baptist Association in 1824.

Campbell is a student of the Enlightenment philosopher John Locke. While he does not explicitly use the term “essentials,” in the Declaration and Address, Campbell proposes the same solution to religious division as had been advanced earlier by Herbert and Locke: “[R]educe religion to a set of essentials upon which all reasonable persons might agree.” The essentials he identifies are those practices for which the Bible provides “a ‘Thus saith the Lord,’ either in express terms or by approved precedent.” Unlike Locke, who sees the earlier efforts by Puritans as inherently divisive, he argues for “a complete restoration of apostolic Christianity.” He believes that creeds serve to divide Christians. He also believes that the Bible is clear enough that anyone can understand it and, thus, creeds are unnecessary.

Campbell combines the Enlightenment approach to unity with the Reformed and Puritan traditions of restoration. The Enlightenment affects the Campbell movement in two ways. First, it provides the idea that Christian unity can be achieved by finding a set of essentials that all reasonable people can agree on. The second is the concept of a rational faith that is formulated and defended on the basis of a set of facts derived from the Bible.

Thomas dies on January 4, 1854, in Bethany, West Virginia, and is buried next to his wife in the Campbell family cemetery.