What is the fuller meaning of this blessing?
It is the summation of all that Almighty God has given us in action and in Holy Writ from the beginning of time. This can best be summarized in the Tabernacle of the Testimony which housed the Ark of the Covenant (Ex 25:16;27:21).
The traditional Catholic Church was built in the shape of a Cross, with the design following the Tabernacle of the Testimony. We have established the Tabernacle which contains the Body of Christ in Holy Eucharist in the position where the Ark of the Covenant is placed inside the Veil.
We replace the Veil with the Altar Rails.
This Sanctuary, the Holy of Holies, represents the Holy Trinity, Father, Son and Holy Ghost, but even with more meaning.
Where the Candlestick and Show-bread were placed is represented the Holy Ghost and Holy Eucharist.
The entrance to the Tabernacle of Testimony represents Jesus, Who is the Door, as He says: “Amen, amen, I say to you, I am the door of the sheep” (Jn 10:7).
Where the Altar of Incense is placed we join our hands at our breast and beseech Our Lord: “I have cried to Thee, O Lord, hear me, hearken to my voice, when I cry to Thee. Let my prayer be directed as incense in Thy sight, the lifting up of my hands, as evening sacrifice” (Ps 140:1,2).
And so, with this blessing, we honor:
God the Father, Author of Creation;
God the Son, Author of Salvation; and
God the Holy Ghost, Author of our Sanctification.
In the Name of the Father, and of the Son, and of the Holy Ghost. Amen.