From the Manual on Indulgences, published 2006 by the USCCB, being a translation of the Enchiridion Indulgentiarum quarto editur.
8 EUCHARISTIC AND SPIRITUAL COMMUNION
§1 A plenary indulgence is granted to the faithful who
1. receive Holy Communion for the first time or devoutly assist at the first Holy Communion of others;
2. on any of the Fridays of Lent devoutly recite after Communion the prayer En ego, O bone et dulcissime Iesu before a crucifix.
§2 A partial indulgence is granted to the faithful who,
using any duly approved pious formula, make
1. an act of spiritual communion;
2. an act of thanksgiving after Communion (e.g., Anima Christi; En ego, 0 bone et dulcissitne lesu).
Anima Christi
Soul of Christ, sanctify me.
Body of Christ, save me.
Blood of Christ, inebriate me.
Water from the side of Christ, wash me.
Passion of Christ, strengthen me.
0 good Jesus, hear me.
Within thy wounds hide me.
Suffer me not to be separated from thee.
From the malicious enemy defend me.
In the hour of my death call me.
And bid me come to thee,
That with thy saints I may praise thee
for ever and ever.
Amen.
(Roman Missal, Thanksgiving after Mass)
En ego, 0 bone et dulcissime lesu
Behold, O kind and most sweet Jesus, I cast myself upon my knees in thy sight, and with the most fervent desire of my soul, I pray and beseech thee that thou wouldst impress upon my heart lively sentiments of faith, hope, and charity, with true contrition for my sins and a firm purpose of amendment; while with deep affection and grief of soul I ponder within myself and mentally contemplate thy five wounds, having before my eyes the words which David the prophet put on thy lips concerning thee: “My hands and my feet they have pierced, they have numbered all my bones.”
(Roman Missal, Thanksgiving after Mass)
