Hebrews 1:3

“Who being the brightness of his glory, etc..] Or “of glory”; of God the Father, the God of glory, and who is glory itself; so called on account of his glorious nature and perfections and because of the glorious manifestations of them in his works of creation and providence, and in the various dispensations of his grace, and especially in his Son; and because he is the author of all glory, in the creatures, in the whole world, in Christ as man and Mediator, and in his own people. Now Christ is the “brightness” of this, as he is God; he has the same glorious nature and perfections, and the same glorious names, as Jehovah, the Lord of glory, etc.. and the same glory, homage, and worship given…”

“Who being--by pre-existent and essential being. brightness of his glory--Greek, the effulgence of His glory. "Light of (from) light" [Nicene Creed]. "Who is so senseless as to doubt concerning the eternal being of the Son? For when has one seen light without effulgence?" [ATHANASIUS, Against Arius, Orations, 2]. "The sun is never seen without effulgence, nor the Father without the Son" [THEOPHYLACT]. It is because He is the brightness, &c., and because He upholds, &c., that He sat down on the right hand, &c. It was a return to His divine glory (Joh 6:62; Joh 17:5; compare Wisdom 7:25-26, where similar things are said of wisdom). express image--"impress." But veiled in the flesh. The Sun of…”

“Who being the brightness of his glory - This verse is designed to state the dignity and exalted rank of the Son of God, and is exceedingly important with reference to a correct view of the Redeemer. Every word which is employed is of great importance, and should be clearly understood in order to a correct apprehension of the passage. First, in what manner does it refer to the Redeemer? To his divine nature? To the mode of his existence before he was incarnate? Or to him as he appeared on earth? Most of the ancient commentators supposed that it referred to his divine dignity before he became incarnate, and proceed to argue on that supposition on the mode of the divine existence. The true…”

“Who sat down - The third of these glorious predicates, with which three other particulars are interwoven, which are mentioned likewise, and in the same order, Col 1:15, Col 1:17, Col 1:20. Who, being - The glory which he received in his exaltation at the right hand of the Father no angel was capable of; but the Son alone, who likewise enjoyed it long before. The brightness of his glory - Glory is the nature of God revealed in its brightness. The express image - Or stamp. Whatever the Father is, is exhibited in the Son, as a seal in the stamp on wax. Of his person - Or substance. The word denotes the unchangeable perpetuity of divine life and power. And sustaining all things - Visible and…”

“1:3 The word translated radiates, found only here in the New Testament, includes an idea of intense brightness. God’s own glory is the glorious manifestation of his presence (Exod 16:7; 33:18; Isa 40:5). The Son’s glory is an expression of God’s glory—the Son of God manifests the person and presence of God (Luke 9:32; John 1:14; 2:11; 17:5; Rom 8:17). • The term translated expresses, used only here in the New Testament, was used of a distinguishing mark imprinted on an object such as a coin. The Son gives a clear picture of the very character of God (John 1:18; Phil 2:6; Col 1:15). • the mighty power of his command (literally his powerful word): God’s word is the powerful, dynamic force that…”

“the brightness: Joh 1:14, Joh 14:9, Joh 14:10; Co2 4:6 image: Co2 4:4; Col 1:15, Col 1:16 upholding: Psa 75:3; Joh 1:4; Col 1:17; Rev 4:11 the word: Ecc 8:4; Rom 1:16; Co2 4:7 by himself: Heb 7:27, Heb 9:12-14, Heb 9:16, Heb 9:26; Joh 1:29; Jo1 1:7, Jo1 3:5 sat: Heb 4:14, Heb 8:1, Heb 10:12, Heb 12:2; Psa 110:1; Mat 22:24; Mar 16:19; Luk 20:42, Luk 20:43; Act 2:33, Act 7:56; Rom 8:34; Eph 1:20-22; Col 3:1; Pe1 1:21, Pe1 3:22; Rev 3:21 Majesty: Ch1 29:11; Job 37:22; Mic 5:4; Pe2 1:16; Jde 1:25 Hebrews 1:4”