You are always allowed to question what you do not understand. You may not always understand or be willing to accept the answers given for your questions; this is often in degree, related to how serious you are about wanting the truth as it relates to the question. Not all can immediately understand the depths of the mysteries as they relate to our Lord and his ways.
The following was taken from the EWTN site and are excerpts from the diary of Sister Faustina.
In 1933, God gave Sister Faustina a striking vision of His Mercy,
Sister tells us:
"I saw a great light, with God the Father in the midst of it.
Between this light and the earth I saw Jesus nailed to the Cross
and in such a way that God, wanting to look upon the earth, had to
look through Our Lord’s wounds and I understood that God blessed
the earth for the sake of Jesus."
Of another vision on Sept. 13, 1935, she writes:
"I saw an Angel, the executor of God’s wrath… about to strike
the earth…I began to beg God earnestly for the world with words
which I heard interiorly. As I prayed in this way, I saw the
Angel’s helplessness, and he could not carry out the just
The following day an inner voice taught her to say this prayer on
ordinary rosary beads:
"First say one ‘Our Father’, ‘Hail Mary’, and ‘I believe’. Then on
the large beads say the following words:
'Eternal Father, I offer You the Body and Blood, Soul and Divinity
of Your dearly beloved Son, Our Lord Jesus Christ, in atonement
for our sins and those of the whole world.'
On the smaller beads you are to say the following words:
'For the sake of His sorrowful Passion have mercy on us and on the
In conclusion you are to say these words three times:
‘Holy God, Holy Mighty One, Holy Immortal One, have mercy on us
and on the whole world’.
And again, for those who do the Divine Mercy Novena, Our Lord dictated the words to be used.
So you see, it is the Lord himself that requires the words to be said as He instructed.
Sister Faustina further states:
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.
The Church has since indicated that going to confession on or very near to Divine Mercy Sunday (within 20 days, no more) will meet our Lord’s requirement.
The confession serves three purposes. First, we humble ourselves to by telling our faults and asking “with a humble and contrite heart,” for forgiveness. This prepares us mentally and spiritually to receive the great “gift” that our Lord offers to us. Secondly, we receive forgiveness, and our soul is again pure before the Lord. Third, it is this purity that we must take before the Lord along with humility, as we receive him in Holy Communion on Divine Mercy Sunday.
And please note, it is not only the going to confession, but also the reception of the Eucharist that fulfills our Lord’s requirement.
Do you understand what our Lord if offering to you here? Not only forgiveness of sins, but remission for all punishment for our sin. When we make a good confession, our sins are forgiven, but we still owe God reparation for those sins. Our Lord Himself, enlightens us as part of the eighth day prayers of the Novena of Divine Mercy:
"Today bring to Me the Souls who are in the prison of Purgatory, and immerse them in the abyss of My mercy. Let the torrents of My Blood cool down their scorching flames. All these souls are greatly loved by Me. They are making retribution to My justice. It is the remission of this retribution that he offers to us, along with forgiveness of our sins.
So, when you can, pray the Divine Mercy Chaplet, exactly as indicated, and next year, starting on Good Friday, begin the Divine Mercy Novena, saying the prayers exactly as indicated. It not man who has dictated the format but Our Lord Himself. Go and make a good confession, humble yourself before the Lord. Then receive the Eucharist on Divine Mercy Sunday. Is this too much to ask in return for the immense gift the Lord offers you in return?