Inasmuch then, as the children have partaken of flesh and blood, He himself likewise shared in the same, that through death He might destroy him who had the power of death, that is, the devil, (15) and release those who through fear of death were all their lifetime subject to bondage.  (16) For indeed He does not give aid to angels, but He does give aid to the seed of Abraham.  (17) Therefore, in all things He had to be made like His brethren, that He might be a merciful and faithful High Priest in things pertaining to God, to make propitiation for the sins of the people. (18) For in that He Himself has suffered, being tempted, He is able to aid those who are tempted.

The author of the letter to the Hebrews is unknown but the language and liberal quotations from the Old Testament indicate it was written by a Jewish man/woman. It was addressed to Jewish Christians who were in danger of disavowing Christ as Messiah and reverting to the Jewish religion (allowable under Roman law) to escape persecution and suffering.  The letter begins by spelling out the doctrine that Jesus Christ  is distinguished from the Father and yet is fully God.

In chapter 2 the author posits as truth that Christ Jesus was also fully human – that Christ had to assume fully human nature (but without sin) to redeem man.  The doctrine is Jesus Christ is one person with two nature’s; the divine and the human – that He set aside His glory in the incarnation and suffered and died as the perfect sacrifice acceptable to God.  He became man to reconcile us with God by full humanity, but for His suffering and death to have merit before God, Jesus had to be fully God

Jesus is our perfect High Priest who has freed us on the cross once and for all from the power of spiritual death which should cause us to draw near to Him in suffering and trials Hebrews is the only book in the New Testament to mention Jesus as our high priest.  The Jews knew they could not approach God directly and had to go through the high priest who offered sacrifices on their behalf: he represented them in everything to God.  Christ Jesus ended the sacrificial system; ended the law, the rites and ceremonies  Jesus is sufficient and we are warned not to look back from Him – not to deny our sure hope in Him. Christ Jesus is God’s final word to us