The canticle Great Indeed Is the Mystery of Godliness (A Song of Christ’s Appearing) was used in the Roman Liturgy of the Hours in Evening Prayer on Transfiguration.
Great indeed is the mystery of godliness:
He was manifested in the flesh,
vindicated by the Spirit,
seen by angels,
proclaimed among the nations,
believed on in the world,
taken up in glory.
Glory be to the Father, and to the Son, and to the Holy Spirit:
as it was in the beginning, is now, and will be forever. Amen.
Source: The Holy Bible: English Standard Version, 1 Timothy 3:16