In Spiritual Communion, we express our fervent desire to receive our Lord in the Blessed Sacrament and to be united with Him. The Church teaches that if you are in a State of Grace and make a Spiritual Communion, you will receive the fruits of the Sacrament.

Prayers for Spiritual Communion

Soul of Christ, be my sanctification;
Body of Christ, be my salvation;
Blood of Christ, fill all my veins;
Water of Christ's side, wash out my stains;
Passion of Christ, my comfort be;
O good Jesus, listen to me;
In Thy wounds I fain would hide;
Ne'er to be parted from Thy side;
Guard me, should the foe assail me;
Call me when my life shall fail me;
Bid me come to Thee above,
With Thy saints to sing Thy love,
World without end.
Amen.

(Anima Christi, attributed to Pope John XXII and translated by St John Henry Newman)

I wish, Lord, to receive you with the purity, humility and devotion
with which your most holy Mother received you,
with the spirit and fervour of the saints.