Jesus appeared to St. Margaret Mary Alacoque (q.v.) and requested that she push for a feast to be instituted celebrating  and symbolising His great love in a heart burning with love for us.  That is why some pictures represent Jesus with an open heart, surrounded by flames.

 

(Featured Image: Sacred Heart of Jesus, Krakow, Poland, taken on February 8th, 2014).

© Frkosma | Dreamstime.com – Sacred Heart Of Jesus Christ Photo