Let us therefore come boldly to the throne of grace… – Hebrews 4:16

God is to be viewed in prayer as our Father; that is the aspect which is dearest to us; but still we are not to regard Him as though He were such as we are; for our Saviour has qualified the expression “Our Father,” with the words “who art in heaven”; and close at the heels of that condescending name, in order to remind us that our Father is still infinitely greater than ourselves, He has bidden us say, “Hallowed be Thy name; Thy kingdom come”; so that our Father is still to be regarded as a King, and in prayer we come, not only to our Father’s feet, but we come also to the throne of the Great Monarch of the universe. The mercy-seat is a throne, and we must not forget this.

If in prayer we come to a throne, it is clear that our spirit should, in the first place, be one of lowly reverence. It is expected that the subject in approaching to the king should pay Him homage and honour. The pride that will not own the king, the treason which rebels against the sovereign will should, if it be wise, avoid any near approach to the throne. Let pride bite the curb at a distance, let treason lurk in corners, for only lowly reverence may come before the king himself when he sits clothed in his robes of majesty. In our case, the king before whom we come is the highest of all monarchs, the King of kings, the Lord of lords. Emperors are but the shadows of His imperial power. They call themselves kings by right divine, but what divine right have they? Common sense laughs their pretensions to scorn. The Lord alone hath divine right, and to Him only doth the kingdom belong. He is the blessed and only potentate. They are but nominal kings, to be set up and put down at the will of men, or the decree of providence, but He is Lord alone, the Prince of the kings of the earth. ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/1024.cfm