Matthew Poole and continuators on Hebrews 1:8

8 But unto the Son , he saith, Thy throne , O God y is for ever and ever : a scepter of righteousness is the scepter of thy kingdom .

In the Father's Apostrophe to the Son, he giveth him the Name of God, and thereby is he proved to have a better one than Angels, made by, and Servants to him; and as the great Gospel-Minister hath a Kingdom in which they are his Ministers and Servants, this Proof is quoted out of Psal. 45.6, 7. It was not to Solomon or David, but to the Son God-Man spoken by the Father. The whole Psalm is written of him, and incompatible to any other is the matter of it. It represents him and his Mystical Marriage to the Church, compare Ephes. 5.23. to the end, Rev. 19.7, 8. and 22.17.

Some Hereticks to elude this proof of Christ's Deity, would make God the Genitive Case in the Proposition, as thy Throne of God, expressly contrary to the Grammar, both in Hebrew and Greek: Others gloss it, that [non-Latin text not transcribed] is the Nominative Case, as, God is thy Throne for ever, &c. i. e. He doth, and will establish it: But this is Cavilling, since it is the Fathers Speech to, and of his Son, describing his Nature in opposition to the Angels before. They were Created Spirits, but He was God; they were Ministers and Servants in his Kingdom, where he was King; therefore his Name and Person is better than theirs. God in the Singular, was a Name never given to any Creature, but is expressive of his Divine Nature, and his relation in the Deity being God the Son.

His Office as God-Man, and great Gospel-Minister, is a Royal one. He is a great King, Angels are subjects of his Kingdom as well as Men, which Royalty is set out by the Ensigns of it; as here, by a Throne, which is an Emblem of Royal Authority, Dominion and Power, whence he displayeth himself in his Kingdom. It is an Heavenly one of a perfect constitution and administration, and of eternal continuance. His it was by natural Inheritance, as God the Son, and as Man united to the God-head, he inheriteth the Priviledges of that Person. This natural Dominion over all things remaineth for ever, Col. 1.16.

Another Ensign of his Royal Dominion and Kingdom is his Scepter, which is His Spirit put out in his Government of the World, and in his special work of Grace, guiding and conforming through his Word and Ordinances, the Hearts of his chosen to the Will of his Father. This Scepter is subjectively Right in it self, and efficiently making all under its power to be rectified according to the right and pure Mind and Will of God: compare Psal. 110.1, 2, 3.

Marginal references: Gr. rightness or straightness.