A small Scottish sect named after John Glas and his son-in-law Robert Sandeman. Glas, who was ordained in 1719 as minister of Tealing, near Dundee, came to hold that the existence of a State Church was unscriptural and challenged the basis of the Presbyterian establishment. He was deposed in 1730. He established independent congregations among his (mainly poor) followers, for whom unordained elders conducted communion services. Leadership gradually passed to Sandeman, who in Letters on Theron and Aspasio (1757) attacked the Calvinist teaching that God imputes the righteous acts of Christ to individual Christians, holding rather that a reasoned faith was the only basis for a proper relationship with God and the attainment of salvation.