89 It was Our wish, venerable brethren, by this general outline, to set before you and the faithful the inner nature of the devotion to the Sacred Heart of Jesus Christ and the endless riches which spring from it as they are made clear by the primary source of doctrine, divine revelation. We think that Our comments, which are guided by the light of the Gospel, have proved that this devotion, summarily expressed, is nothing else than devotion to the divine and human love of the Incarnate Word and to the love by which the heavenly Father and the Holy Spirit exercise their care over sinful men. For, as the Angelic Doctor teaches, the love of the most Holy Trinity is the origin of man's redemption; it overflowed into the human will of Jesus Christ and into His adorable Heart with full efficacy and led Him, under the impulse of that love, to pour forth His blood to redeem us from the captivity of sin(94): "I have a baptism wherewith I am to be baptized, and how am I straitened until it be accomplished?"(95)
Source: Haurietis Aquas (Vatican.va)