A Treatise Concerning Religious Affections is a famous publication written in 1746 by Jonathan Edwards describing his philosophy about the process of Christian conversion in Northampton, Massachusetts, during the First Great Awakening, which emanated from Edwards' congregation starting in 1734. Edwards wrote the Treatise to explain how true religious conversion to Christianity occurs. Edwards describes how emotion and intellect both play a role, but "converting grace" is what causes Christians to "awaken" to see that forgiveness is available to all who have faith that Jesus' sacrifice atones for all sins.
