13 “And we have seen, and are witnesses, that God has sent His Son to be the Saviour of the world.” Set your minds at rest, you that are sick: such a Physician has come, and do ye despair? Great were the diseases, incurable were the wounds, desperate was the sickness. Do you note the greatness of your ill, and not note the omnipotence of the Physician? You are desperate, but He is omnipotent; Whose witnesses are these that first were healed, and that announce the Physician: yet even they are made whole in hope rather than in the reality. For so says the apostle: “For by hope we are saved.” We have begun therefore to be made whole in faith: but our wholeness shall be perfected “when this corruptible shall have put on incorruption, and this mortal shall have put on immortality.” This is hope, not the reality. But he that rejoices in hope shall hold the reality also: whereas he that has not the hope, shall not be able to attain unto the reality.
Source: Homilies on the First Epistle of John (New Advent)