Prayer for the Transfiguration of the Lord

O God, who in the glorious Transfiguration of your only Begotten Son confirmed the mysteries of faith by the witness of the Father and wonderfully preconfigured our full adoption as your children, grant we pray to your servants, that listening to the voice of your beloved Son, that we may merit to become co-heirs with him, who lives and reigns with you in the unity of the Holy Spirit, God forever and ever, Amen.