20 Moved therefore by this consideration, to the end that the minds of the faithful may have from Our hands salutary food and consequently after such nourishment be able more easily to arrive at a deeper understanding of the true nature of this devotion and possess its rich fruits, We will undertake to explain those pages of the Old and New Testament in which the infinite love of God for the human race (which we shall never be able adequately to contemplate) is revealed and set before us. Then, as occasion offers, We shall touch upon the main lines of the commentaries which the Fathers and Doctors of the Church have handed down to us. And finally, We shall strive to set in its true light the very close connection which exists between the form of devotion paid to the Heart of the divine Redeemer and the worship we owe to His love and to the love of the Most Holy Trinity for all men. For We think if only the main elements on which the most excellent form of devotion rests are clarified in the light of Sacred Scripture and the teachings of tradition, Christians can more easily "draw waters with joy out of the Savior's fountains."(14) By this We mean they can appreciate more fully the full weight of the special importance which devotion to the Sacred Heart of Jesus enjoys in the liturgy of the Church and in its internal and external life and action, and can also gather those fruits of salvation by which each one can bring about a healthy reform in his own conduct, as the bishops of the Christian flock desire.
Source: Haurietis Aquas (Vatican.va)