The Gospel is John 20:19-31, doubting St. Thomas. It may surprise and amaze us that the Apostles were so reluctant to believe that Christ had risen from the dead, to live forever in glory with his Father in heaven. But we must remember that during their two or three years with him they saw nothing in him but a mere man, one with divine powers, but yet a man; certain prophets of the Old Covenant had some such powers also. Christ had "emptied himself of his divine nature, and he had foretold his resurrection many times. But that he could be really God, as well as man, was something they could not then grasp, and if he was a mere man death had to be the end.

Their slowness of faith had its value for the future Church and for all of us. If they had been expecting the resurrection, and anxiously looking forward to it, people could say that they imagined it, that they persuaded themselves it had happened. Indeed, there have been men proud of their acuteness of judgement, who have said that the story of the resurrection is a story of mass hallucination, although all the evidence proves the opposite. Their conviction that it could not happen, could not be removed from their minds except by impressive evidence that it had. Hallucination is born in a mind already expecting and hoping for the imagined fact.

We can thank the Apostles and especially Thomas, the last to give in, that our faith in the resurrection and divine glorification of Christ is that much the stronger. Our Christianity which would have ended before the first Easter week had passed, if Christ had not risen in glory, spread rapidly to the then known world and is still spreading, because its author was none other than Christ "our Lord and our God." How prophetic were the words of of Gamaliel at the meeting of the Sanhedrin which tried to prevent the Apostles from preaching the new Christian faith: "If this plan or work is of men, it will be overthrown; but if it is of God, you will not be able to overthrow it." (Acts 5: 38-39).

Source:  https://www.catholicculture.org/

Jesus to Faustina

On one occasion, I heard these words: "My daughter, tell the whole world about My inconceivable mercy. I desire that the Feast of Mercy be a refuge and shelter for all souls, and especially for poor sinners. On that day the very depths of My tender mercy are open. I pour out a whole ocean of graces upon those souls who approach the fount of My mercy. The soul that will go to Confession and receive Holy Communion shall obtain complete forgiveness of sins and punishment. On that day all the divine floodgates through which graces flow are opened. Let no soul fear to draw near to Me, even though its sins be as scarlet. My mercy is so great that no mind, be it of man or of angel, will be able to fathom it throughout all eternity. Everything that exists has come forth from the very depths of My most tender mercy. Every soul in its relation to Me will contemplate My love and mercy throughout eternity. The Feast of Mercy emerged from My very depths of tenderness. It is My desire that it be solemnly celebrated on the first Sunday after Easter. Mankind will not have peace until it turns to the Fount of My Mercy.

"[Let] the greatest sinners place their trust in My mercy. They have the right before others to trust in the abyss of My mercy. My daughter, write about My mercy towards tormented souls. Souls that make an appeal to My mercy delight Me. To such souls I grant even more graces than they ask. I cannot punish even the greatest sinner if he makes an appeal to My compassion, but on the contrary, I justify him in My unfathomable and inscrutable mercy. Write: before I come as a just Judge, I first open wide the door of My mercy. He who refuses to pass through the door of My mercy must pass through the door of My justice.

"From all My wounds, like from streams, mercy flows for souls, but the wound in My Heart is the fountain of unfathomable mercy. From this fountain spring all graces for souls. The flames of compassion burn Me. I desire greatly to pour them out upon souls. Speak to the whole world about My mercy."

—Excerpted from Diary of Sr. M. Faustina Kowalska.