112 Besides, they have the firm conviction that they are moved to honor God not primarily for their own advantage in what concerns soul and body in this life and in the next, but for the sake of God's goodness they strive to render Him their homage, to give Him back love for love, to adore Him and offer Him due thanks. Were it not so, the devotion to the Sacred Heart of Jesus Christ would be out of harmony with the whole spirit of the Christian religion, since man would not direct his homage, in the first instance, to the divine love. And, not unreasonably as sometimes happens, accusations of excessive self-love and self-interest are made against those who either misunderstand this excellent form of piety or practice it in the wrong way. Hence, let all be completely convinced that in showing devotion to the most Sacred Heart of Jesus the external acts of piety have not the first or most important place; nor is its essence to be found primarily in the benefits to be obtained. For if Christ has solemnly promised them in private revelations it was for the purpose of encouraging men to perform with greater fervor the chief duties of the Catholic religion, namely, love and expiation, and thus take all possible measures for their own spiritual advantage.
Source: Haurietis Aquas (Vatican.va)