 The Second Part of the Religion moves on to Christology and the alleged role of Christ in our salvation. Kant begins with a discussion of the Incarnation and whether it can be interpreted in such a way that is compatible with pure rational religion (AK 6:60–6:66). He then moves on to three “difficulties:” how to understand the doctrine of Sanctifying Grace (the “change of heart” or moral regeneration) in relation to pure rational religion; whether an individual can know his/her moral status as having undergone a “change of heart”, and how this relates to the challenge of moral perseverance; how to understand the “debt of sin” or the issue of “Justifying Grace”. On this issue, we again see Kant opposing the prevailing doctrines of his day, explicitly rejecting the idea of “vicarious atonement” (AK 6:72–73) as anathema to pure rational religion.