A Treatise Concerning Religious Affections is a famous publication written in 1746 by Jonathan Edwards describing his philosophy about the process of Christian conversion. 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. This salvation is not possible through believers' imperfect good works which are simply evidence of faith, only through Christ's sacrifice which is free to all. Edwards describes the importance of testing new faith and discerning whether it is legitimate. He lays out twelve tests of true conversion, including ways of measuring allegedly fruitful works.