All grace flows from mercy, and the last hour abounds with mercy for us. Let no one doubt concerning the goodness of God; even if a person's sins were as dark as night, God's mercy is stronger than our misery. One thing alone is necessary: that the sinner set ajar the door of his heart, be it ever so little, to let in a ray of God's merciful grace, and then God will do the rest. But poor is the soul who has shut the door on God's mercy, even at the last hour. It was just such souls who plunged Jesus into deadly sorrow in the Garden of Olives; indeed, it was from His Most Merciful Heart that divine mercy flowed out.  - St Faustina (Diary 1507)