The division of this work into two main parts, namely an investigation of the doctrine of Hervaeus and his circle on original justice and a similar study of original sin, is partly a matter of methods; for in the concept of original sin itself is quite indefinite unless the character of original justice is clearly grasped. Another reason for the separate treatment of original justice is this: for the past twenty-five years or so there has taken place a dispute concerning the doctrine of St. Thomas on the nature of original justiceaThe doctrine of Hervacus Natalis on the several problems arising out og the dogma of original sin is considered as necessarily related to the controversy from which largely it developed.