Devotion is a “total dedication, commitment, and handing over of oneself to the Person of Christ and what He has at Heart.”
It means leaving ourselves open to the impact of His personality in our lives. It means to give a loving response as we experience Him. It means responding with a total giving in as His ideals  and attitudes, His message and life work become known to us. It means anything but mere words and hollow actions!  If we allow it, His impact on us gradually integrates our behavior, motivates our whole way of living, and brings a unity within ourselves, with God and with others. He becomes as it were, the “master-idea” and “chief motivating force” in our lives. In short it becomes a “spirituality”.

“Updated Devotion to the Sacred Heart” by Rev. Walter Kern 1975, page 30-31.