As I now understand, and as BookCat so kindly pointed out:
There is in the Private Revelation to St. Faustina a special grace received by the faithful whom receive communion in a state of grace and trusting in the Divine Mercy of our Lord - this is what I thought OP was referring to the first post.:
thedivinemercy.org: Understanding Divine Mercy Sunday - PDF Chapter III, opening and section 1 - please click thru for context
– this is not related to the indulgence established by the Church other than being a feast day. Once again I advise reading the above document.
There is also a plenary/partial indulgence as BookCat so kindly pointed out, and InNomineDomini seems to dismiss as unimportant - least I corrupt devout Catholics by pointing out the Grace one receives from the feast-day according to the private revelation given to St. Faustina (Lord forbid I should force anyone to believe in this - certainly not my intent):
On June 29, 2002, in a decree of the Apostolic Penitentiary, the Holy Father Pope John
Paul II granted a plenary and a partial indulgence to the devout observance of the Second Sunday of Easter, “Divine Mercy Sunday.” The decree offers:
a plenary indulgence, granted under the usual conditions…
If you read further in the above document you well see (emphasis by my hand):
thedivinemercy.org: Understanding Divine Mercy Sunday - PDF Chapter IV, section 3
It is important to note that the Church’s provision of these indulgences for Mercy Sunday devotions
does not constitute either a substitute for, nor an official endorsement of, the extraordinary graces promised by our Lord to St. Faustina for those who receive Holy Communion with trust in God’s mercy on that day. As explained above (see Chapter IV, section 3), the complete renewal of baptismal grace promised by our Lord to St. Faustina — the “extraordinary grace” par excellence of Divine Mercy Sunday — is something even greater than a plenary indulgence.
This new plenary indulgence offered by the Church is therefore an opportunity to receive additional graces on this extraordinary feast day!
THUS - of one is seeking **only **the plenary/partial indulgence as established June 29, 2002 - then the ordinary conditions apply and please feel free to ignore the Mercy that St. Faustina writes about in her diary.
HOWEVER, if you believe in the Feast of Divine Mercy as reveled to St Faustina, then there is a much greater grace to be received along with the indulgence as established by St. Pope JP-II.
PLEASE - CLICK THRU TO THE PDF FILE or got to the thedivinemercy.org site directly and locate the document there… of course there is the link in my sig to to a talk given by Fr. Alar that covers this information… for those that don’t like to read. Personally, I find him very easy to listen to.
Therefore as so often happens in our faith, it’s not either/or but both/and… I am both Right and Wrong - just depends upon which aspect of the Divine Mercy Sunday one is discussing and I hope that people following this thread can see where I mixed the two aspects of the Divine Mercy Sunday instead of thinking that I would promote something contrary to the magisterium in some malformed and dangerous attempt to lead people astray.