Continued from here….
There follows after these different kinds of supplication a still more sublime and exalted condition.
This is brought about by the contemplation of God alone and by fervent love, by which the mind, transporting and flinging itself into love for Him, addresses God most familiarly as its own Father with a piety of its own.
And, that we ought earnestly to seek after this condition, the formula of the Lord’s prayer teaches us, saying “Our Father.”
When then we confess with our own mouths that the God and Lord of the universe is our Father, we profess forthwith that we have been called from our condition as slaves to the adoption of sons.
Next we add “Which art in heaven,” so that, by shunning with the utmost horror all lingering in the present life which we pass upon this earth as a pilgrimage and all that separates us by a great distance from our Father, we may the rather hasten with all eagerness to that country where we confess that our Father dwells.
[…] When we have advanced to this state and condition of sonship, we shall forthwith be inflamed with the piety which belongs to good sons, so that we shall bend all our energies to the advance not of our own profit, but of our Father’s glory.
Saying to Him: “Hallowed be Thy name,” we testify that our desire and our joy is His glory, and become imitators of Him who said: “He who speaks of himself seeks his own glory. But He who seeks the glory of Him who sent Him, the same is true and there is no unrighteousness in Him” (John 7:18)….
Being filled with this feeling, St Paul wished that he could be anathema from Christ (cf. Rom. 9:3), if only the people belonging to Him might be increased and multiplied, and the salvation of the whole nation of Israel accrue to the glory of His Father.
For with all assurance could he wish to die for Christ as he knew that no one perished for life. And again he says: “We rejoice when we are weak but ye are strong” (2 Cor. 13:9).
[…] But where it is said “Hallowed be Thy name,” it may also be very fairly taken in this way: “The hallowing of God is our perfection.”
And so when we say to Him “Hallowed be Thy name” we say in other words, make us, O Father, such that we may be able both to understand and take in what the hallowing of Thee is, or at any rate that Thou mayest be seen to be hallowed in our spiritual converse.
And this is effectually fulfilled in our case when “men see our good works, and glorify our Father Which is in heaven” (Matt. 5:16).
John Cassian (c. 360-435): Conferences 9, 18 [slightly adapted].