The writer began his epistle with an affirmation of Jesus Christ"s greatness to introduce his readers to his subject. This section is one sentence in the Greek text. It contrasts God"s old revelation with the new, specifically by presenting God"s Son as superior to all other previous modes of revelation. [source][source][source]
"It would be misleading to think of Hebrews 1:1-4 as stating a thesis to be proved, or as giving a prcis of the following argument. The author proceeds rather by an interweaving of themes, as in musical composition." [1][source]
"The literary structure of the exordium [2] exhibits a concentric symmetry (A [3] B [4] C [5] C" [6] B" [7] A" [8]): the conceptual correspondence of Hebrews 1:1; Hebrews 1:4 serves to frame the several statements concerning the Son in Hebrews 1:2-3 ..."[source]
"The core of the exordium (B C C" B") describes Jesus in an arresting way as the royal Song of Solomon , divine Wisdom of Solomon , and the royal Priest." [9][source]