One of the graces I have received in my pastorate of the Divine Mercy Parish is the opportunity to read the Diary of St. Faustina: Divine Mercy in my Soul. I am really convinced that one day, she will be declared Doctor of the Church on account of this diary.
"In the Old Covenant I sent prophets wielding thunderbolts to My people. Today I am sending you with My mercy to the people of the whole world. I do not want to punish aching mankind but I desire to heal it, pressing it to My Merciful Heart. I use punishment when they themselves force Me to do so; My hand is reluctant to take hold of the sword of justice. Before the Day of Justice I am sending the Day of Mercy." (Diary, 1588.)
ZENIT - St. Faustina, Doctor of the Church?