Blessed are those who trust in the Lord; the Lord will be their trust.
They are like a tree planted beside the waters that stretches out its roots to the stream:
It does not fear heat when it comes, its leaves stay green;
In the year of drought it shows no distress, but still produces fruit.

Jer. 17, 7-8

St. Sister Faustina about trust

(Selected parts of the Diary of St. Faustina Kowalska)

Happy is the soul that calls upon the mercy of the Lord. It will see that the Lord will defend it as His glory, as He said. And who would dare fight against God? All you souls, praise the Lord‟s mercy by trusting in His mercy all your life and especially at the hour of your death. And fear nothing, dear soul, whoever you are; the greater the sinner, the greater his right to Your mercy, O Lord (Diary 598).

The soul gives the greatest glory to its Creator when it turns with trust to The Divine Mercy (Diary 930)The soul desirous of more of God‟s mercy should approach God with greater trust; and if the trust in God is unlimited, then the mercy of God toward it will be likewise limitless (Diary 1489)

Even [some] souls that are chosen and well-advanced (156) in the religious life or the spiritual life do not have the courage to entrust themselves completely to God. And this is so because few souls know the unfathomable mercy of God and His great goodness (Diary 731).

Satan has admitted to me that I am the object of his hatred. He said that “a thousand souls do me less harm than you do when you speak of the great mercy of the Almighty One. The greatest sinners regain confidence and return to God, and I lose everything. But what is more, you persecute me personally with that unfathomable mercy of the Almighty One.” I took note of the great hatred Satan has for the Mercy of God. He does not want to acknowledge that God is good (Diary 1167).