“The events of Good Friday and, even before that, in prayer in Gethsemane, introduce a fundamental change into the whole course of the revelation of love and mercy in the messianic mission of Christ. The one who ‘went about doing good and healing’ and ‘curing every sickness and disease’ now Himself seems to merit the greatest mercy and to appeal for mercy, when He is arrested, abused, condemned, scourged, crowned with thorns, when He is nailed to the cross and dies amidst agonizing torments. It is then that He particularly deserves mercy from the people to whom He has done good, and He does not receive it. Even those who are closest to Him cannot protect Him and snatch Him from the hands of His oppressors. At this final stage of His messianic activity the words which the prophets, especially Isaiah, uttered concerning the Servant of Yahweh are fulfilled in Christ: ‘Through his stripes we are healed.’”
~ John Paul II, Dives in misericordia, par 7.