This message and devotion to Jesus as The Divine Mercy is based on the writings of Saint Faustina Kowalska, an uneducated Polish nun who, in obedience to her spiritual director, wrote a diary of about 600 pages recording the revelations she received about God's mercy. Even before her death in 1938, the devotion to The Divine Mercy had begun to spread. This message and devotion to Jesus as The Divine Mercy is based on the writings of Saint Faustina Kowalska, an uneducated Polish nun who, in obedience to her spiritual director, wrote a diary of about 600 pages recording the revelations she received about God's mercy. Even before her death in 1938, the devotion to The Divine Mercy had begun to spread.