Another point of theological contention between the western and eastern churches is the doctrine of purgatory (as it was shown at the Second Council of Lyons and the Council of Ferrara–Florence). It was developed in time in Western theology, according to which, "all who die in God's grace and friendship, but still imperfectly purified, are indeed assured of their eternal salvation; but after death they undergo purification, so as to achieve the holiness necessary to enter the joy of heaven." However, some Eastern theologians, while agreeing that there is beyond death a state in which believers continue to be perfected and led to full divinization, consider that it is a state not of punishment but of growth. They hold that suffering cannot purify sin, since they have a different view of sin and consider suffering as a result of a spiritual sickness. Western theology usually considers sin not only as a sickness that weakens and impedes but also as something that merits punishment.