The novena to the Divine Mercy that Jesus had St. Faustina write and pray before the Feast of Mercy.

"The Lord told me to pray the [Mercy Rosary] for nine days before the Feast of Mercy."
"Through this novena I will grant to the souls all kinds of graces"
(Journal 796).

Divulging the devotion of the Divine Mercy
"You must be merciful to others, always and everywhere.
You can not omit yourself, apologize or justify yourself.
I give you three ways of practicing mercy for your neighbor: the first is action, the second the word, and the third the prayer.
In these three degrees rests the fullness of mercy, for they constitute an irrefutable proof of love for Me.
It is in this way that the soul glorifies and honors My mercy "
(Journal, 742).
"... but he writes it to many souls who sometimes worry about not possessing material goods, to practice with them mercy.
However, it has much greater merit
the mercy of the spirit, for which no authorization or warehouse is required and
is accessible to all.
If the soul does not practice mercy in one way or another, it will not reach My mercy on the day of Judgment "
(Journal, 1317).
"... does what is within your reach by spreading the worship of My mercy.

I will complete what you can not.
Tell sorrowing Humanity to dwell in My merciful Heart, and I will fill it with peace...
When a soul approaches me with confidence, I fill it with so many graces that it can not contain them all in itself and radiates them to other souls.
The souls that spread
the worship of My mercy, I defend them all my life as a tender mother defends her little son ... "
(Journal, 1074-1075).

"To the priests who proclaim and glorify My mercy I will give an extraordinary power, anointing their words, and I will touch the hearts of those to whom they speak"

(Journal, 1521).