The doctrine is not accepted by the Eastern Orthodox churches, who normatively teach John Cassian's doctrine of theosis. Substitutionary atonement is particularly stressed by Protestant and evangelical churches. In the Roman Catholic tradition this doctrine is balanced by the duty of Roman Catholics to perform Acts of Reparation to Jesus Christ which in the encyclical Miserentissimus Redemptor of Pope Pius XI were defined as "some sort of compensation to be rendered for the injury" with respect to the sufferings of Jesus. Pope John Paul II referred to these Acts of Reparation as the "unceasing effort to stand beside the endless crosses on which the Son of God continues to be crucified".