The liturgy of the Solemnity of the Sacred Heart of Jesus also permits another phrase, similar to this, to be used as the communion antiphon. It is taken from the Gospel of John: Whoever is thirsty, let him come to me. And let the one who believes in me drink. As the Scripture has said: “Out of his heart shall flow rivers of living water” (cf. Jn 7:37ff.) In faith we drink, so to speak, of the living water of God’s Word. In this way the believer himself becomes a wellspring which gives living water to the parched earth of history. We see this in the saints. We see this in Mary, that great woman of faith and love who has become in every generation a wellspring of faith, love and life. Every Christian and every priest should become, starting from Christ, a wellspring which gives life to others. We ought to be offering life-giving water to a parched and thirst world. Lord, we thank you because for our sake you opened your heart; because in your death and in your resurrection you became the source of life. Give us life, make us live from you as our source, and grant that we too may be sources, wellsprings capable of bestowing the water of life in our time. We thank you for the grace of the priestly ministry. Lord bless us, and bless all those who in our time are thirsty and continue to seek. Amen. 

Pope Benedict conclusion of Homily on the feast of the Sacred Heart 2010