“Both the One who makes men holy and those who are made holy are of the same family. So Jesus is not ashamed to call them brothers.”
And because men are flesh and blood, Jesus also is flesh and blood. “He too shares in their humanity.” (Hebrews 2:14) “He is made like His brothers in every way in order that He may become a merciful and faithful high priest in service to God, and that He may make atonement for the sins of the people.” (Hebrews 2:17) Jesus is flesh and blood so He may help those who are tempted, having been tempted Himself. “In bringing many sons to glory, it is fitting that God should make the Author of their salvation perfect through suffering.” (Hebrew 2:10) Because of this direct experience with suffering, Jesus as the High Priest “is able to deal gently with those who are ignorant and going astray, since He Himself is subject to [human] weakness” though not to sin as other high priests. (Hebrews 5: 2) Rather, He “is tempted in every way, just as [they] are — yet is without sin.” (Hebrews 4:15) Therefore, He is able to sympathize with people, in every way.
The author of Hebrews then calls Christians “holy brothers, who share in the heavenly calling.” (Hebrews 3:1) The author calls these holy brothers “God’s house.” (Hebrews 3:6)
So, since Christians are the house of God and holy, “let us hold firmly to the faith we profess.” (Hebrews 4:14) “Let us approach the throne of grace with confidence, so that we may receive mercy and find grace to help in time of need.” (Hebrews 4:16) Let us “fix [our] thoughts on Jesus, the Apostle and High Priest whom we confess.” (Hebrews 3:1)