Sacred Heart
In the 17th century, writers who followed Christian Asceticism wrote about the devotion of the "Sacred Heart of Christian Jesus".  For example, Ascetic writers from the Society of Jesus wrote about the devotion many times. The image of the Sacred Heart of Jesus became very common. It was popular because many people used the image in the Franciscan devotion to the "Five Wounds" (explanation needed). The image also became popular because many Jesuits - members of the Society of Jesus- put the image on the first page of their books and on the walls of their churches.