Your throne is established of old: you are from everlasting.
Read Chapter 93
Augustine of Hippo
AD 430
5. "Thy throne is established from thence, O Lord" (ver. 2). What is, "from thence"? From that time. As if he said, What is the throne of God? Where doth God sit? In His Saints. Dost thou wish to be the throne of God? Prepare a place in thy heart where He may sit. What is the throne of God, except where God dwelleth? Where doth God dwell, except in His temple? What is His temple? Is it surrounded with walls? Far from it. Perhaps this world is His temple, because it is very great, and a thing worthy to contain God. It contains not Him by whom it was made. And wherein is He contained? In the quiet soul, in the righteous soul: that is it that containeth Him. ...He who said, "Before Abraham was, I am:" not before Abraham only, but before Adam: not only before Adam, but before all the angels, before heaven and earth; since all things were made through Him: he added, lest thou, attending to the day of our Lord's nativity, mightest think He commenced from that time, "Thy throne is established...
Of old. Literally, "that time "ex tunc, (Worthington) alluding to some distant period, Isaias xvi. 13. (Calmet)
God's throne is established over creatures, as soon as they exist. (Haydock)
Yet he is eternal, (Menochius) as Christ is likewise. At his ascension, He placed his sacred humanity on the throne. (Calmet)
His kingdom, the Church, continues for ever. (Worthington)