As stated in our mission, the Apostleship of Prayer is "nourished by the love of the Sacred Heart of Jesus." We also promote devotion to the Heart of Christ in various ways.

We know that the Sacred Heart of Jesus is in some ways an advanced theological/devotional concept. The Catholic Encyclopedia has a long explanation. Here is one excerpt:

(2) Foundations of the Devotion

The question may be considered under three aspects: the historical, the theological, and the scientific.

(a) Historical Foundations

In approving the devotion to the Sacred Heart, the Church did not trust to the visions of St. Margaret Mary; she made abstraction of these and examined the worship in itself. Margaret Mary's visions could be false, but the devotion would not, on that account, be any less worthy or solid. However, the fact is that the devotion was propagated chiefly under the influence of the movement started at Paray-le-Monial; and prior to her beatification, Margaret Mary's visions were most critically examined by the Church, whose judgment in such cases does not involve her infallibility but implies only a human certainty sufficient to warrant consequent speech and action.

(b) Theological Foundations

The Heart of Jesus, like all else that belongs to His Person, is worthy of adoration, but this would not be so if It were considered as isolated from this Person and as having no connection with It. But it not thus that the Heart is considered, and, in his Bull "Auctorem fidei", 1794, Pius VI authoritatively vindicated the devotion in this respect against the calumnies of the Jansenists. The worship, although paid to the Heart of Jesus, extends further than the Heart of flesh, being directed to the love of which this Heart is the living and expressive symbol. On this point the devotion requires no justification, as it is to the Person of Jesus that it is directed; but to the Person as inseparable from His Divinity. Jesus, the living apparition of the goodness of God and of His paternal love, Jesus infinitely loving and amiable, studied in the principal manifestations of His love, is the object of the devotion to the Sacred Heart, as indeed He is the object of the Christian religion. The difficulty lies in the union of the heart and love, in the relation which the devotion supposes between the one and the other. Is not this an error long since discarded? If so, it remains to examine whether the devotion, considered in this respect, is well founded.

(c) Philosophical and Scientific Foundations

In this respect there has been some uncertainty amongst theologians, not as regards the basis of things, but in the matter of explanations. Sometimes they have spoken as if the heart were the organ of love, but this point has no bearing on the devotion, for which it suffices that the heart be the symbol of love, and that, for the basis of the symbolism, a real connection exist between the heart and the emotions. Now, the symbolism of the heart is a fact and every one feels that in the heart there is a sort of an echo of our sentiments. The physiological study of this resonance may be very interesting, but it is in no wise necessary to the devotion, as its foundation is a fact attested by daily experience, a fact which physiological study confirms and of which it determines the conditions, but which neither supposes this study nor any special acquaintance with its subject.

(3) The Proper Act of Devotion 

This act is required by the very object of the devotion, since devotion to the love of Jesus for us should be pre-eminently a devotion of love for Jesus. It is characterized by a reciprocation of love; its aim is to love Jesus who has so loved us, to return love for love. Since, moreover, the love of Jesus manifests itself to the devout soul as a love despised and outraged, especially in the Eucharist, the love expressed in the devotion naturally assumes a character of reparation, and hence the importance of acts of atonement, the Communion of reparation, and compassion for Jesus suffering. But no special act, no practice whatever, can exhaust the riches of the devotion to the Sacred Heart. The love which is its soul embraces all and, the better one understands it, the more firmly is he convinced that nothing can vie with it for making Jesus live in us and for bringing him who lives by it to love God, in union with Jesus, with all his heart, all his soul, all his strength.

 

For more visit: http://www.newadvent.org/cathen/07163a.htm