The heart has always been seen as the "center" or essence a person ("the heart of the matter," "you are my heart," "take it to heart," etc.) and the wellspring
The heart has always been seen as the “center” or essence a person (“the heart of the matter,” “you are my heart,” “take it to heart,” etc.) and the wellspring of our emotional lives and love (“you break my heart,” “my heart sings,” etc.) Devotion to the Sacred Heart of Jesus is devotion to Jesus Christ Himself, but in the particular ways of meditating on his interior life and on His threefold love — His divine love, His burning love that fed His human will, and His sensible love that affects His interior life.
Pope Pius XII of blessed memory writes on this topic in his 1956 encyclical, Haurietis Aquas (On Devotion To The Sacred Heart).
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