Devotion to the Sacred Heart is essentially a worship of and response to the Person of Christ, seen precisely from that ultimate understanding of Him that He is  a loving Person.  It is not a devotion to a part of Him, namely the Heart, but a relationship with Him specifically because He is a loving Person, who is perceived in that basic origin of all that He is and does  – from the Heart.

“Updated Devotion to the Sacred Heart” by Rev. Walter Kern 1975