Stone board in the place of revelation of the image of Merciful Jesus with the inscription: Plock on February 22, 1931 - "I Want this image to be commemorated in entire World" - In this monastery Sister Faustina from the Congregation of the Sisters of Our Lady of Mercy had the first vision of the image of the Mercy and here for the first time she heard the recommending the establishing a church holiday the Divine Mercy.