St. Faustina's Diary (Diary of Saint Maria Faustina Kowalska)

St. Faustina's Diary records her spiritual experiences and visions of Jesus Christ, emphasizing His mercy and love for humanity. She describes messages from Jesus urging trust in God's mercy, the importance of prayer, especially the Divine Mercy Chaplet, and acts of compassion. The diary highlights her mission to spread devotion to Jesus’ mercy, encouraging believers to seek forgiveness and trust in divine compassion. It serves as a spiritual guide, inspiring devotion, hope, and understanding of God's infinite mercy, and played a key role in popularizing the Divine Mercy devotion within the Catholic Church.