It's about Jesus priesthood his humanity how he became a man , faced sufferings and every temptation we do but he never sinned he overcame temptation lived a holy life facing mankind's plight experiencing mankind's Infirmities and even death which man brought upon themselves . There's about two or three chapters talking about that in hebrews
Chapter 2
14Forasmuch then as the children are partakers of flesh and blood, he also himself likewise took part of the same; that through death he might destroy him that had the power of death, that is, the devil;
15And deliver them who through fear of death were all their lifetime subject to bondage.
16For verily he took not on
him the nature of angels; but he took on
him the seed of Abraham.
17Wherefore in all things it behoved him to be made like unto
his brethren, that he might be a merciful and faithful high priest in things
pertaining to God, to make reconciliation for the sins of the people.
18For in that he himself hath suffered being tempted, he is able to succour them that are tempted."
Chaoter5
14Seeing then that we have a great high priest, that is passed into the heavens, Jesus the Son of God, let us hold fast
our profession.
15For we have not an high priest which cannot be touched with the feeling of our infirmities; but was in all points tempted like as
we are, yet without sin.
16Let us therefore come boldly unto the throne of grace, that we may obtain mercy, and find grace to help in time of need.
Which leads to the scripture your wondering about
7Who in the days of his flesh, when he had offered up prayers and supplications with strong crying and tears unto him that was able to save him from death, and was heard in that he feared;
8Though he were a Son, yet learned he obedience by the things which he suffered;
9And being made perfect, he became the author of eternal salvation unto all them that obey him;
10Called of God an high priest after the order of Melchisedec.
We know Jesus is God the creator but we have a hard time with he became a man and made himself subject to God to be our high priest and intercessor we did t have a perfect man to intercede now we do